Product Reviewed: SAE 10W-30 Signature Series Synthetic Motor Oil (ATM)
Current Rating: 4.91 out of 5 stars
Votes & Reviews: 163 vote(s) and 1024 user reviews.
Reviewed by K-Mac: 
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2005 Honda Fit 1500cc..
Reviewed by K-Mac:
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2016 Nissan Caravan NV350.
Reviewed by Jeff:
I run Amsoil oil and filter in my Yukon Denali 15,000 miles between changes. Just reset the change oil message at 7500. Doing this for years with several GMC Yukon's. At 250,000 plus miles no oil burn at all. Very impressed with not having to go under the car twice as much.
Reviewed by Ricky:
Awesome cold start protection, and anti-wear lube, simply the best
Reviewed by Mustang Larry:
So far all is good.
Reviewed by Mustang Larry:
Why is it when I change my oil does my mileage drop by 2mpg. For the first 400 miles 1 1/2 to 2 mpg less then it creeps back up.
Reviewed by Ron the Tyrolian:
I have relied on Amsoil products for years to protect my engines and it has done exactly that.
Reviewed by SamLac:
I started using AMSoil in the mid 80s while in Alaska. Cold extreme make lubrication very critical. At minus 40, most petroleum lubes won't even drip off the dip stick and when started cold you can hear every bearing in the engine as there is little or no lube flowing. No so with my AMSoil.
Reviewed by Jeff:
I've been running 5W30 Signature Series in my 2002 Tacoma since putting it on the road in 2016 with 116,000 miles on the engine. I have since had Oil Analyzers (Amsoil, Inc.) test three samples from the truck so far, and have yet to have the oil last more than 13K miles before being told it's time for it to be changed. So much for the 25,000 miles/1 year claim...
Reviewed by Grizz:
I have 2 vehicles that have had this oil in them (changed every 15,000mi) since I bought them new. They both have mileage approaching 250,000, and they run like BRAND NEW. My newest vehicle is a 2017 Subie Forester Turbo so it gets Signature 5W-30 every 10,000 miles, and I'm sure it will see 200k and beyond.
Reviewed by GF1563:
Love the extended oil change intervals and my fuel mileage increased slightly, which leads me to believe it must be lubricating everything very well.
Reviewed by Pat:
It's great year round hot or cold
Reviewed by Don:
Several years ago I switched to Amsoil in my GMC Yukon. I was very impressed with what the Signature Series 5w-30 Motor Oil looked like after the first oil change. With all the oils and products that Amsoil offers, I have since switched everything I own over to Amsoil. Even my lawnmowers.
Reviewed by dhgguy:
Used in my F150 exclusively. Excellent oil & filter.
Would not use anything else.
Reviewed by Ronv:
I have used Amsoil for 30 years and wouldn't think of using any other oil.
Reviewed by Mister nice:
Love that you don't have to change oil as offer as regular oil. Is is a little high. Hey but you get what you pay for.
Reviewed by Henry:
I use Amsoil exclusively
Reviewed by Jblev77:
#1 for 3.5L ecoboost
Reviewed
by Ed:
I like being about to change oil at any time between 5-10k and not have to worry about weather or not the oil is doing it job !!!
Reviewed by RebelnOhio:
I have been using Amsoil for over 15 years and have never had a problem, it's a well proven product that I trust in all of my cars for work and for pleasure. I will will continue to use Amsoil and benefit from it's proven results! I own a Livery/Limo Service and I drive about 40-50K miles a year on various cars and I believe Amsoil is the best Oil for all of my vehicles. With the long 15k Mile change intervals it is a money saving gem and your engine benefits 100%. I recommend there products highly!
Reviewed by KENT:
I've used this brand and series in my Dodge Ram 4.7 v-8 since I acquired it at 90,000 miles. I've driven another 70,000 miles since and the engine is stronger than it's ever been! I expect to drive this truck until at least 300K miles because of the Amsoil Signagture Series Synthetic brand motor oil. I won't use anything else!
Reviewed by KK:
I use Amsoil on my SUV and love it!
Reviewed by Tom:
I use ansoil on all of my trucks, motorcycles, ATVs. This oil I use on 2017 Hemi 2500. It cannot be beat.
Reviewed by G:
Instant satisfaction, after the first start up i could already hear and feel things running smoother.
Reviewed by Redtundra8:
This is the best oil money can buy in my opinion. I use this in all my vehicles and have for the last 12 years. Love only having to change the oil once a year. I highly recommend this product.
Reviewed by Pat:
Bestboil products on the market by far. I run it in all my vehicles
Reviewed by Billy G:
I have used Amsoil products for many years in all of my vehicles and small engines. I have never had an issues. I recommend Amsoil even though it is not the cheapest but the delivery is very prompt.
Reviewed by Wingsprnt:
Not sure about the oW-20 weight here in Florida, but that is what Honda calls for.
Reviewed by Greg:
Always met my expectations.
Reviewed by MatsB:
Using Amsoil in all of my family's cars. Using Signature series in cars that drive over 12,000 miles per year, and XL series in cars that drive less than 12,000 miles.
Sent a 27,000 mile sample for testing to a independent lab, and they recommended 30,000 miles next time based on the excellent results.
Also using Amsoil in all lawn equipment and for a standby generator.
Reviewed by Robert Long:
Great product gives better fuel mileage and cleaner oil after changes
Reviewed by Tim:
I've been using Amsoil since the 1980s in everything with an engine. And have bragged about it's benefits to anyone who'd listen.
Reviewed by Rob:
I get better mileage with Amsoil
I run my 4x4 very hard and Amsoil is doing a great job of keeping it running strong
Reviewed by Elvis of Aragorn:
My 2004 Silverado (5.3L V8) has had a steady diet of Amsoil since its second oil change. I have stuck to the 10,000 mile interval, using Amsoil Ea filters & Signature Oil. She's about to roll over the 200,000 mile mark, and I have had no engine issues. I use Amsoil Signature Synthetic Oil in all of my vehicles, and plan on keeping it that way.
Reviewed by Pinto:
I'm city driving in a 4x4 Ford van and after my last oil change the oil was still in great condition after 15,000 miles. just used the cleaning solution so lets see how this improves engine longevity. really happy with all th products I have received.
Reviewed by S2kadi:
I use Amsoil Signature Series in both of my cars that are susceptible to burning oil. The 10W30 goes into my Honda S2000 and works great! Amsoil is the only oil I use in my motors and gearboxes, after trying out several different brands, I have found their quality to be of the best.
Reviewed by pro4100:
I use it in my Subie Forester and my silverado 1500. no problems ever!
Reviewed by Quick charge water:
Yeah like to 25,000 my old changed
Reviewed by Beast:
I will never use conventional again. 10K mile Oil changes, or once a year. You cant beat the quality and value of this product. No dealer or mechanic can ever persuade my to change every 3k miles again!. Get you some!
Reviewed by ScoobyVTEC:
Bought Amsoil for all of my cars so I wouldn't have to change the oil so frequently and for the protection it gives all of the internal moving parts. I've noticed an increase in MPG and smoothness when I drive.
2017 Civic Type R
2012 Pilot Touring AWD
1998 Civic EX
Reviewed by Donvito:
I use this in my 2005 Jimmy 4.3 Vortec. I've started using it since 30,000 km on the vehicle which I've owned since new. I love this oil. I go one full year 25,000 km before I change the oil along with the Amsoil filter. Oil is great, engine runs quiet and effectively with this brand.
Reviewed by Eddie:
I have discovered about amsoil about 2 years ago, and from then and now. I have switched to amsoil for all my vehicles. Especially my 96 Jeep grand Cherokee. I had to change my oil every 2months because it was burning the oil really fast. Till i made the switch, 8 months and the oil is still in good condition. This product sure made my money's worth. I really recommend this brand of oil.
Reviewed by Rallimaro:
I always order signature series for every oil change on all my vehicles and very been disappointed with the protection.
Reviewed by Jim:
The bottle is shaped just right in the opening makes for a clean poor without using a Funnel
Reviewed by Rick:
Straight up go smell the difference between the basic conventional oil, leading competitors and amsoil. You'll smell the difference. From regular oil to semi senthetic to full senthetic to amsoil you smell the synthetic in its distinct form. I'm OCD AF so I will only go 3,000 miles per oil change regardless of them saying I can go 25,000, but... I get a lot less chain chatter with amsoil over the leading competitors (since I can't name names)! What ever, we'll keep it PG.
Reviewed by PJ:
I have used the Automobile oils, the outboard engine oils and lower unit lubrication . I have also used the new gun oil lubricants because they work. I give all of the products that I have used a 5 Star Rating. Their boat trailer wheel grease which must go in and out of the water is great also. After launch and retrieve I go down the road at 65 mph with splendid results!
PJ
Reviewed by roadpounder:
I have been using signature 10-30 in my vehicles for several years now and it really protects, keeps things quieter and cooler, I love this oil, it's all I use.
Reviewed by Mgk:
I use it in all my gas powered vehicles
Reviewed by BB:
Yes you can change your oil once a year. Got to use Amsoil filters though. GREAT PRODUCT and saves a lot of time and money over 5 oil changes in a year with regular oil. will never go back to regular oil.
Reviewed by Josh:
I use the full line of amsoil products in my home garage/shop and have been very satisfied with all of them in all of my personal cars, powersports, and customer vehicles.
Reviewed by Eric:
My car usaully can burn about .3-1 quart of oil every 4k interval. Since I switched to amsoil I have not have any oil consumption problems no matter how hard I beat on my car. I LOVE THIS STUFF. I use it on every vehicle.
Reviewed by Nightrider:
Ever since I've started to use Amsoil products, my vehicles have been running more efficiently. I would highly recommend Amsoil products to anyone wishing to reduce the wear and tear on their vehicles.
Reviewed by Steve A.:
I use Amsoil in all three of my vehicles. After reading and researching this product I'm confident that my engine is protected to the fullest. I feel the smoothness of the engine every time I mash my accelerator. Very confident in the additives to clean, the lubricants as it coats, and the molecular structure to keep my engines running smooth. And to top it off, I only change oil annually. I'm a believer...
Reviewed by Chuck:
Have used this product for a couple years now. Great oil. Will not use any other oil
Reviewed by TurboZ:
I've used Amsoil in my personal & family vehicles for over 10-years now. For these applications I use the Signature series 5W, and 10W-30. Since switching to Amsoil I've had zero mechanical motor issues and both engines are now approaching 200,000 miles and still running strong! I'm a DIY home mechanic so my cost per car is about $65 a year (including everything: tax, shipping, oil and filters).
Amsoil is... Superior protection with just one oil change per year, per car! You can't beat that!
Reviewed by Dog:
I use Amsoil in my farm equipment and vehicles. Use nothing else.
Reviewed by David:
It was originally recommended to me by a friend nearly 20 years ago and I have used nothing in my vehicles but Amsoil lubricants ever since. I have a pick up with nearly a quarter of a million miles on it and still going strong. I think that they are the best products made for all your vehicles, bar none.
Reviewed by Jerry:
Good product
Reviewed by Flemwad:
I have it in both my vehicles 2005 Toyota tundra and in my 2015 Toyota Camry I love the stuff words can't describe. Zero friction zero where . I have six of my closest friends all hooked on it too and they love it as well
Reviewed by Richard:
My engine and transmission both have responded very well to your products. My engine even runs smoother
Reviewed by R Speakerphone:
There seems to be a slight advantage using Signature Series over the XL oil. It seems like I get an additional one or two miles per gallon when using Signature Series compared to XL. One thing that is unusual about Signature Series is that it can take on a red tint after a few thousand miles. I was concerned that this might indicate that transmission fluid had contaminated my engine oil (?). Calling customer service and speaking with a technician, I was assured by the technician that this is caused by the anti-oxidants in the oil that sometimes take on a red tint.
So far, I'm
very happy using Amsoil products and will continue to do so.
Reviewed by G:
Great customer service
Reviewed by CruzCTRL:
With Amsoil, I am saving time not waiting at the dealership, not paying them to change my oil, not worrying if my oil cap is tight; now I'm changing it myself every 10,000 miles, gaining 3-5 MPG, and, if I catch the deal, it's delivered to my house for free. All pros, no cons.
Reviewed by Al:
Have been using this product since I bought my truck new in 2007. Have seen an increase in mpg. Recommend the oil.
Reviewed by mtncamp:
Been using Amsoil for around 6-8 years on my 1999 Yukon with 205,000 miles had oil tested about month ago test come back with very good results no probelms at all. The 1997 truck has Amsoil in engine and transmission pulls camper 198,000 miles no issues so far. And all my small engines has Amsoil in them also
Reviewed by Sergey the Welder:
Use this for our 2009 VW Routan SEL Premium with 4.0L, and the van loves it! We have taken it up and down west coast numerous times without an issue!
Reviewed by Dan:
I have used only AMSoil since 1982, best I have ever used.
Reviewed by Poppy:
Love this oil. I use it in my Toyota Camry and 4Runner. Along with the dedicated amsoil oil filter it is great.
Reviewed by TJ:
I use this in my Turbo Honda Civic 400+ Hp. At normal drain intervals and hasn't failed me yet excellent gas mileage and protection . Also use Amsoil Ea oil filter
Reviewed by Capgoat6:
Signature series has always held the highest protection standards for engine oil. Never an oil problem, and knowing that you are protecting the powerplant for your vehicle is so important nowadays.
Reviewed by Cool Breeze:
I have used Amsoil products on both my motorcycle (2012 Victory Cross Country Tour) and car (2007 Dodge Magnum SXT) for many years, after the initial NEW break-in of their engines. This is an excellent product that I would recommend all to use.
Reviewed by Stephen:
This is a great fully synthetic oil that never disappoints. I love the extended change intervals that I get with this product. I can run this oil for extended drain intervals and not worry one bit due to the quality of this product.
Reviewed by Doug in So Cal:
The three most important things you can do for your car: warm it up, drive slowly as the moving parts warm up, and change the oil regularly. Since I wanted my Toyota truck to last, and I hate to change the oil, I use Amsoil. It's superior, and it only has to be changed once a year. Really! I ran fossil oil until after the engine was broken in, like 25,000 miles or so, then Amsoil for engine, trannie and differential since then. I bought my truck new in 1998, and it now has 344,000 miles on the original motor and trannie. Everyone who knows, knows Amsoil is far and away the best.
Reviewed by slopoke:
I have been a preferred customer since 1989. All my vehicles, Cars and Pick ups have the 10w-30 signature since new. 200K miles plus on each, and still running strong. Replaced a valve cover gasket on a 1993 Chevy 4 cyl. with 180K miles, top of cyl. head brand new with no gunk. Was using the Amsoil By-pass system with this car.
Reviewed by JR:
I have been using Amsoil on all my vehicles for a couple of years. I really enjoy the extended change intervals and the protection Amsoil provides. This is the only oil I will use. Engines seem to run a lot smoother and gas mileage has increased a bit.
Reviewed by Jerryc:
Using 30 wt in hour Honda Pilot as it leaks and burns the 5 wt.
Reviewed by Hooligan:
Used in my well cared for 1994 subaru legacy engine with 250k miles and after only using conventional oil. Engine sounds and drives better than I can ever remember. Engine always sounded a little strained/frantic above 4.5k rpm, now sounds like lower rpm just faster. Totally happy.
Reviewed by HB:
I have used Amsoil oils in my vehicles for 15 years. All of them have been 1990's or older. They keep the trucks/car running great! Not only that, but changing oil once a year is so much nicer with multiple vehicles than every 3000 miles.
Reviewed by Doogie:
Use this oil in all my personal vehicles
Reviewed by Joe:
I have a 2013 Hyundai Sonata. Great car. I have been using Amsoil after the first scheduled oil change and have noticed better performance, meaning the engine cranks over easier. The car runs, my opinion, a lot better. During my driving and idling with this car, I noticed that the engine has a small pinging noise. Soon after I get a recall notice in the mail from Hyundai that during the engine building process, there were small metal shavings that were not completly taken care during the the assembly of the main bearings, thus this will cause a "pinging in the engine. Huyndai will futher investigate this matter and send another notice explaining a course of remedy. I was using Amsoil 5W-20 signature series oil, and since I live in Utah and according to the owners manual I can use 10W-30. I purchased 10W-30 signature series oil and when the time came to drain and fill with oil, I put in the 10W-30. There is no pinging noise, however to be truthful, I think because of the heavier oil I have not been getting the mileage that I did with 5W-20. But i'm willing to sacrifice milieage for a heavier oil that could outlast the Hyundai problem. I highly recommend Amsiol oil.
Reviewed by Loaded Diaper:
This oil is used in my 675 hp BBC.
Reviewed by Sam:
I'm very picky about the oil I run in all my vehicles. I have a first generation miata with very low miles that only gets fed this oil. It comes out very useable and clean still even after about 7500 miles that I run it too which consists of a lot of very high engine speed at 4k and above.
Reviewed by Popo:
My truck is running so much better! The engine seems so much smoother.
Reviewed by don't have one:
I don't use any other product in my vehicles, only Amsoil Baby.. if you want the best buy the best here it is Amsoil.
Reviewed by Bob:
The oil is good, but with the membership fee and high shipping costs I am going back to Mobile 1 as I did not see much if any of a difference. There is just to many hoops they make you jump through. There should just be a cost to buy it and no membership fee that AMS Oil makes people think they are locked in to buying oil from them so they can "get the most of the membership". I think most people find annoying and just go buy another oil rather than pay high prices on top of shipping and also a fee just to buy it at a reasonable price.
Reviewed by DaveTheDoode:
Using Amsoil in all my vehicles for loong years and never had engine fail!!!
Reviewed by Archer m:
I used this in my 1998 jeep Cherokee 4.0 and gained 3 pounds of oil pressure over a competitors high mileage 10w-30 overall I would highly recommend. But next time I will use the premium protection 10w-40 because the older jeep engines do have flat tappet camshafts and like extra zinc. I just bought a 1989 jeep Comanche with a renix 4.0 that had a wiped cam because lack of quality oil (not enough zinc) and I'm replacing an engine in a 1997 Jeep Wrangler 2.5 for a friend of the family because of the same reason. Great oil!!!
Reviewed by Gary:
I use AMSOIL motor oils in all my vehicles, have used them for many years and consider them superior to all other motor oil brands.
Reviewed by Adam Delgado:
Best oils ever hands down run it in all my cars including my 331
Reviewed by old guy:
I only use Amsoil in everything i own .
Reviewed by Jomo Watts:
Best investment for any vehicle long term, 25,000-mile intervals for oil and filter. You save so much and the quality of the oil is far better than all I've tried!!!
Reviewed by ffokcaj:
By using amsoil it is saving money in the long run {less oil changes every year]ect.
]
Reviewed by Five cars and one motorcycle:
Yes I would buy again been using this product for years about 20 years
Reviewed by JACK I.:
Great oil. No problems
Reviewed by John:
I use Amsoil exclusively in all my vehicles and I have do so for years. The cars include a Jaguar Vanden Plas with 136,000 miles, a Hyundai XG350 with more than 360,000 miles, and a 1990 Chevrolet Celebrity 3.1 V6 with well over half a million miles on it. None of them have ever required any significant engine work and all drive well, use almost no oil and get excellent gasoline mileage. Additionally, I use Amsoil in a restored 1932 Ford V8, again, with no problems at all. There isn't any other oil I would even consider purchasing. Obviously, I use different Amsoil in different vehicles according to specifications.
Reviewed by Shrimp:
I use Amsoil in both my car and my motorcycle! Better than anything out in the market!
Reviewed by Chris:
Great product to buy and also dependable
Reviewed by BobCat:
I started using Amsoil Engine Oil in a higher mileage (130k) V6 and have noticed less lifter noise on startup. The oil seems to have good viscosity after 3k miles which should indicate longer oil change intervals. I also changed all fluids (diffs, trans, transfer case) over to Amsoil and have been very pleased with how the drive train feels. Of course new fluid always makes it better but it seems to coast and accelerate better than ever so I think the fluids have improved the vehicle performance slightly. At this time I haven't noticed any drastic MPG improvement but I do think there's just a little more power.
Reviewed by
BullderBob:
I use AMSOIL 10-30 Signature in 3 vehicles,,and have an AMSOIL user for over 25 years.
I use 10-30 Signature in all 3 vehicles,and AMSOIL Diesel oil in my daughters Class A motor home
Canada
United States
A Trusted Product
I have been using Amsoil products in my vehicles and motorized equipment for many years and relay on its quality. As a "gearhead", I know how important using quality motor oils and greases are to machinery. They are my first choice for lubrication fluids.