Off the bat I will say that this oil is the best dang oil I have ever used in my High HP engines. It is the only oil that doesn't get beat to death by the engine. Also, having said that, it is the only oil that quieted the valve train too!! Its like a smooth sewing machine. My hot rod gets this oil ONLY, NO ACCEPTIONS. It runs smooth as silk and I have no issues AT ALL! AMSOIL certainly knows fluids on all levels. In my High Performance 1972 Monte Carlo (completely rebuilt by me and my life long friend, known as the "Magical Maestro Car Gnome") has all AMSOIL product in the vehicle, gear oil, transmission fluid and of course the 15W50. I am completely amazed how well their fluids works. Once I run out of bearing grease, I will begin to use that too, among more of their other wonderful products. It may cost a tad more, but I rest easy knowing my vehicles are well protected with this wonder fluid. So its well worth it and it lasts longer! if you have a heavy hitter, High HP vehicle like me, then this stuff is it! Don't even wait another second, just order it for your beast in the garage. YOU WILL BE PLEASED! Yours truly, Dan

This is the oil I use in my high compression 565 big block chevy for track days. This is definitely the oil to go with if you want to protect your race car while you beat on it going down the track.

It's oil, seems to work well. First time using it so we'll see how it holds up. But it's Amsoil, so I'm pretty confident it will be fine.

Recently made some changes to my 532ci. BBF and was going to replace the rod bearings while having it apart. After 3 seasons of 200’ mud drag racing, the bearings still looked new. Ended up putting them back in and looking forward to another race season, thanks to Amsoil Dominator Racing oil!

Always have been using this oil for the Subaru since I bought it! Great product!

Been using this for years and it's protection is unsurpassed

Have been using Amsoil 15-50 since I resurrected a 1992 mustang LX with. 5.0 stock motor for 3 years on various road race courses (Mid Ohio, NCM, Ozarks, Pitt raceway, Gingerman, etc with NASA. Superb lune and engine remains rock solid and pulls strong running at 6200 rpm changing oil after every 2 race weekends

Best oil to use. I use it on my motorcycle and never had a problem with the motor. I would recommend it to everyone

Great oil. No issues been using it for 7 + years. Perfect for how the engine is built to have good oil pressure at idle.

This is the only oil I will ever use on my 70 roadrunner motor runs cooler stronger, warms up faster better all positives

This is all I’ll use! When you have thousands dumped into a high horsepower build with with very tight specs and tolerances, I come to AMSOIL for my oil needs. The high content of phosphorous and zinc also help protect the investment. Oil is crucial to any build, no sense in going with anything but the best!

Keeping my race car running high RPMs with confidence. I have been using 15-50 for 2 years since engine rebuild. No pinging, oil pressure holding strong.

I have used Dominator race oil in my dirt track car for the last 10 years, I never had an oil related part failure or any excessive wear on any parts. My engine builder said what I’m using keep using it works.

Change it every 1,000-1,500 miles for my turbo LS daily driver.

My truck runs smooth and fuel mileage has increased.

I’ve used Thor racing oil for years in most engines I’ve assembled past couple years I’ve used both dominator and 4T with great results with very minimum wear when rebuild times roll around. Highly recommend either of these 2 oils. They also mix well with methanol and nitromethane.

Great Product I run in my Built Evo 8.

Definitely will Purchase again

I bought this oil to run in my modified racecar and it works great some of the cleanest oil I’ve ever saw after running for about 9 hours at 5500 to 6200 rpm most oil is black but this oil was still somewhat clean!

We all know it’s the good stuff. Shipping was fast.