Product Reviewed: Dominator® Synthetic 5W-20 Racing Oil (RD20)
Current Rating: 5 out of 5 stars
Votes & Reviews: 15 vote(s) and 93 user reviews.
Reviewed by Darrell: 
This is the best oil you can buy Does a car eng. good !!
Reviewed by Ron:
Dropped my water temp by 12 degrees !! Great product !
Reviewed by Robert:
I use this product in my street rod, a 1930 ford with a 466 inch ford motor. I believe the oil is dewing its job but when I been submitting the oil for testing I am getting results that do not make sense. Other wise I will continue using this oil..
Reviewed by Jj:
Great oil, run it in our Briggs animal kart motors on methonal... Keeps the motor at cooler running temps
Reviewed by Jim:
I wouldn't use anything else in our racing engine. This engine had 300,000 miles on it when we put it in our racecar. Now, in the racecar, it's lasted 2 full seasons and still going strong.
Reviewed by Fred:
We run this in our imca 604 crate engine works great
Reviewed by John:
Best there is!
Reviewed by Christopher:
Works great in my supercharged Vette!
Reviewed by Jeremy:
Great product and customer service
Reviewed by John:
Necessary to maintain the 1966 396 engine in my Super Sport. Full synthetic has many added values over conventional oil especially in cars that get low mileage, irregular usage.
Reviewed by Stephen:
Great oil for my 60 yr old car, I also amsoil in modern cars better fuel mileage
Reviewed by Delbert:
As usual awesome stuff!
Reviewed by Jeremiah:
I use Amsoil in all my vehicles. Bought this for my 1977 Ford F-250 after the top end of the original 351M was rebuilt. Thought it would be the right choice for this classic motor. Time will tell.
Reviewed by Brenda:
This is beneficial to eliminate wear in older cars from the oil not having zinc. Very happy with this product and recommend it.
Reviewed by Eric:
I use this oil in a pair of merc 540's, which have been dyno'd over 600hp. It's the only oil I will use and with over 300 hours on these engines, this says it all.
Reviewed by Ron:
Great oil for BMW airheads
Reviewed by Dave:
I've used Amsoil for years in all my diesels now it's time for my old cars too. Great product and I'm very happy with the results
Reviewed by Dennis:
This goes into my '69 Corvette, 427 internal protection is the target for this oil. I like the rust inhibitor that is present to protect the internal components of the engine when it is inactive and the over all protection when I take her out for a drive. A good oil at a good price.
Reviewed by George:
Perfect weight for a big block Chev, doesn't blow through the motor while racing, like similar oils do. Great product from a great company
Reviewed by Hector:
I've tried a number of different motor oils over the years. Mobil 1, Royal Purple and a few others. Amsoil Z-Rod is definitely the best oil I've ever used in my Reher Morrison Chevy 540 big block. The engine maintains a higher oil pressure even on a hot day! Appears I've gained additional horsepower also!
Provides peace of mind knowing my motor is protected and producing maximum power!
Reviewed by Michael:
Using it in my mower engine running cooler and oil is staying clean after 20 hour of running hard.
Reviewed by Jason:
The only oil I'll use in my racecars
Reviewed by Looj:
If you dont want to wipe out cam lobes, USE THIS PRODUCT!!!!!!!!!!!!!
Reviewed by moros323:
I have been running Amsoil in my last 3 cars I love it and the protection it offers!
Reviewed by Classic's for life:
Bought it for a 73 mustang. Love the product.
Reviewed by Dave:
Perfect for a air cool VW
Reviewed by the Painter:
I bought this oil based on the fact that it has extra added Zinc for flat tappet cams generally used in hot rod motors and the fact it is known in the hobby to be excellent oil.
Reviewed by cmart:
Used product for engine with high compression and required high zinc content
Reviewed by Huck:
I have a '73 Bronco with a 302 V-8 engine. It has a mild flat tappet cam and a few other goodies. Because of the 'flat tappet cam' the engine needs oil with zinc. The Amsoil Z-ROD Syn. is exactly what the 302 ci. needs as it contains high levels of ZDDP for max. protection.
Reviewed by CharlieB:
I use this product in my 1952 M38A1 Willy's Army Jeep
The engine runs quiet and smooth with this oil
Reviewed by Mike "Mad Scientist":
I have been a long time Amsoil user myself for all my racecar/street car applications. When I opened my shop it was only fitting to stick with the best! All my customers cars/builds get Z-rod or Dominator series and with great results.
Reviewed by Robert:
Amszoil is the best Oil I've ever used I'm back to using it after realizing the higher price is worth the way higher quality
Reviewed by G:
Use in my 1969 Corvette.
Plan to start using in my 79 280ZX and 80 Bronco
Reviewed by Drivr51:
I use this product in my 602 crate circle track engine to optimize HP all the meantime protecting my engine from the harsh elements. Love this oil.
Reviewed by Mike:
I wanted the best flowing highest zinc content for my Hemi Charger. Amsoil was my choice. Cost a little more but only the best for my baby!!!
Reviewed by Tacomaracing:
Best racing oil I have used in high horsepower racing go karts.
Reviewed by MotoMack:
I use this in my EBR1190rx race bike, engine has been raced or on track for 8000 miles, engine is still in amazing condition, no loss in power, compression and leak down test are top notch.
Reviewed by KO:
Great oil for your vehicle. Wouldn't use anything else
Reviewed by S30:
After much research needed a top quality oil to protect my 44 year old classic car. Z Rod fits the bill. The best protection out there.
Reviewed by 454_Burban:
I use this oil in my '93 k2500 suburban with the 454tbi motor, It has a mild cam that calls for a zinc additive. I get my used oil lab tested and the tests show that this oil holds up better and provides more protection than the previous high-zinc oil I was using. I now use Amsoil in all of my vehicles and recommend it to friends every time.
Reviewed by Vinny:
I've been using Amsoil for over 5 years now. This stuff is really incredible! Even with higher oil temps it really does hold up well over a long race. We recently started using this in our endurance car (Acura Integra) and so far it has held up remarkably well!
Reviewed by Sam:
Good Product and helpful people at their Las Vegas warehouse
Reviewed by JDragon:
One of the higher Zinc oils my motor loves. It quieted my lifter tick and my motor just feels more healthy overall. Bought two cases after making sure it was really helping.
Reviewed by B:
As always amsoil comes through and produces one amazing product! Does everything promises. Great oil for great price. Use amsoil products on all my cars!
Reviewed
by john tran:
I use this on my c6 corvette that has a cam and upgraded valvetrain. with this oil my oil pressure is alot more consistent even in the more extreme oil temps. i used to use mobil one synthetic but that stuff is like water compared to this oil at high temps. my motor is protected and i feel alot more confident driving my car hard
Reviewed by Will:
I run AMSOIL oil and gear lube I all my antique autos. Unbeatable protection in my opinion for older, seldom driven vehicles.
Reviewed by Army dude:
I use this in my 68 gto, fantastic zinc content, holds solid psi even in warmer temps. Won't use anything else.
Reviewed by Bayman:
Seems to keep the engine purring smoothly even after "getting on it" once daily driven now weekend fun car -
2005 Subaru STi
Motor built by Andrew Ashman of OKC
Tuned by him as well.
Reviewed by Self proclaimed Amsoil fanboy:
I use this oil in Ford 390 FE engine with flat hydraulic flat tappets, and 235 inline 6 Chevy with flat tappets. The correct amount of zinc is why I use this oil.
Reviewed by Lane with the big block camaro:
I started running it in my big block camaro and I won't run anything else. The engine runs smoother and it also brought the temps down
Reviewed by 1_wikd_v:
Inuse it for my tranny and motor oil
Reviewed by Max:
I think this is the best oil for my '68 Firebird.
Reviewed by
Tominator:
Put Amsoil in my 03 Cobra engine and transmission. Noticed a positive difference right away. Engine started faster and idled smoother. My T56 Magnum trans(6 speed) shifted gears more smoothly as well.
Reviewed by E63 amg:
Absolutely love the quality of amsoil!! I use only the best on my motors!
Reviewed by Bushmaker:
Product is GREAT!!! I use in my Yamaha YXZ and can NOT complain about this oil. I have been in the red on my gauges for over half a race and still to this day have not had any motor issues.
Reviewed by Sunny D:
Love this oil for my supercharged car with 180k miles.
Reviewed by Ed:
I choose this for my 79 Mustang as it has a non-roller cam and I want to ensure the longest wear and service from the cam and the engine. I trust this oil to meet the needs of my car which are different than modern ones.
Reviewed by Rover Guy:
This is a great product for after rebuilding and maintaining my all aluminum block Rover engines. I use it in both my competition trail truck and my daily driver.
Reviewed by Tim:
I road race a large ci fe ford. It is pushing 4000 miles. The engine has never been freshened and it has never had a failure!
Reviewed by Mike:
In my 2011 Flush Stage 2 Mustang. Never worry about a thing using Amsoil. I have been using Amsoil in all my vehicles in sliding my 2009 HD Softail Custom
Reviewed by Superjet:
Mix with pump 91 gas for my superjet jet ski. The best oil I've ever used and smells great !
Reviewed by Steve O:
Little concerned my vehicle never used any oil before using the competitors brand I have used I have used a half quart of Amsoil oil now on the last seven hundred miles
Reviewed by M Series Rebuild:
We rebuild a lot of vintage flat tappet engines. This product performs as advertised; we have had excellent results for years.
Reviewed by Dalt:
Great product, delivered super-fast.
Reviewed by Moto Gizmo:
I use this oil for both my Superformance AC Cobra MK3 and 93 Mustang GT with 347 Ford Performance engine. I feel confident I am getting the best protection money can buy!
Reviewed by
Wheelchair Pete:
Like this stuff as it provides needed ZDDP protection for all of my flat tappet camshaft antiques.
Reviewed by Millz:
I run a dirt track car so my oil sees extreme conditions with heat, cycles, and dirt. I use to change my oil after 3 nights out and would then send an oil sample off to get tested and they would come back with the oil is at the end of its life. I then switched over to this amsoil dominator 15-50 mid last year. I sent an oil sample off after 3 races and they told me the oil was practically new still. I then sent a sample off after 6 races and they said the oil its self was still good but recommend I change it because of high silicone (dirt) content in it.
Reviewed by N/a:
Great protection from racing
Reviewed by John parrino:
I think is best stuff out there!!!!
Reviewed by Long time customer:
AmsOil Z-Rod is by far the best oil for older engines that were designed to use motor oil with Zinc. I have used it for many years, and I've never had any issues.
Reviewed by Pose:
The best oil for my newly rebuilt 1963 Buick 215 Aluminum V8
Reviewed by Mike:
Stays clean and never had a oil related failure
Reviewed by regulat guy Mike:
I have used amsoil in my harley and cars as well for a few years now, U still remember the first time I used it in my twin turbo stealth. It ran much smoother and quieter. The same in my harley. This is the best oil in the market, I have tried others before Amsoil but nothing is better.
Reviewed by Ike:
I run a stroked 6.1 to a 6.6 Hemi 10.8:1 Compression. I need an oil that takes a pounding driving to work or doing some street racing. Very happy with Amsoil products.
Reviewed by JimP:
I bought this oil primarily for the ZDDP in it. The engine (67' BBC) runs cooler and quieter. I would buy this again, but probably to 20w-50 vibe the 10w-30.
Reviewed by Hoff Motorsports #117:
I do asphalt circle track racing and Amsoil is all I use! When I'm cranking my car over 9000 rpms it's all I trust!
Reviewed by JLG:
Using in an 87 Grand National built up with alcohol. Big turbo with 400 trans, run with this oil and have no complaints. Also have been using for years in 1960 Pontiac with 565 bow-tie block over 1350 horsepower with 1071 blower.
Reviewed by Chris:
It lubricates as intended.
Reviewed by Bull:
Great
Reviewed by NFR:
Use in our 602 Crate Sportsman Modified
Reviewed by Fredster1101:
have used Amsoil products for last 20 years in cars, trucks, motorcycles and boats.
I have used the top tier Signature Blend several times for the 25K Mile/1 year change interval and have not experienced any problem with wear or failure OR any excessive use during these change intervals.
I see no reason to use any other fully synthetic product in my vehicles, with
having the preferred membership prices available, and the cost of anything else is higher for not as good of product!
Reviewed by john:
I use it in many hot rod cars I work on. good stuff.
Reviewed by mustang65:
very good product, been using it for years
Reviewed by Billy G:
Antique cars such as my 65 Vette needs oil made under different specs than today's cars. Amsoil ZROD is made from specs the manufacture required when these high compression engines were plus it has zinc
Reviewed by Odie:
I have a 2015 Ram 1500. I have used the product after 5k miles and now have 45k miles. I change the oil every 10k because I am overly cautious. I am very pleased with Amsoil so far. It not scientific but the truck "feels like" it has more pep, and the engine is quieter compared to the factory's filled oil.
Reviewed by Tony Bogus:
I'm a Ford fanatic and have built and Worked on 302s, both 351s, 4.6 DOHC and 4.6 PI , 4.6 3 Valve, 5.0s 5.8s 4, Valve as well as FE plus 385 series. I was using Royal Purple until it thinned out in my Coyote ! I just spend too much money along with a lot of time, effort and energy to use oil that going to cause me issues and premature failure! Tony Bogus!!!
Reviewed by Bobby:
Americans have been harnessing and producing horsepower since the early 1900's, so who better to provide quality that protects our investments. I love pushing the envelope of power and Amesoil Company has proven themselves to provide oil and other products that keep me enjoying my rides. And still Making America Great!!
Reviewed by fastblue7:
clean longer,better oil pressure,runs cooler.
Reviewed by James:
Just have my race bike motor rebuilt and i could've used the old bearings they looked immaculate.
Reviewed by Jace:
I bought a 2000 Mustang GT 4.6l with 94,000 miles on it that might not ever have had an oil change. Amsoil brought it back to life and the pony intends to stay with me indefinitely.
Reviewed by Jamie1177:
I run this oil in a 2005 Ran with 35" tires and 6"lift towing a 20' enclosed trailer loaded for racing and actually seen a 2.5 mpg improvement. This engine spends a lot of time above 4K rpm driving up and down mountains.
Reviewed by Jamie:
I run this oil in a 2005 Ran with 35" tires and 6"lift towing a 20' enclosed trailer loaded for racing and actually seen a 2.5 mpg improvement. This engine spends a lot of time above 4K rpm driving up and down mountains.
Canada
United States
T/A using synthetic oil
I use it in a 1979 Trans Am with the Pontiac 400 CI engine with 53K miles. Seems to hold great oil pressure from idle to high rpms. I have not noticed the leakage of oil associated with the change from conventional oil to synthetic oil.