Schaeffer Manufacturing Co. 9001-012 Supreme 9000 Full Synthetic Racing Engine Oil 5W-50, 1-Quart Bottle (Pack of 12)

I’ve experimented enough with various high end synthetics in my life and ended up with this as an absolute best for my application.I Tun this year round (in Texas) in my highly modified Audi 2.7t engine that is producing ~475 hp, so about 175 hp per liter of displacement, which is not a small feat, especially for the engine with 275k miles on it. So it gives you an idea. Even with that much power and that many miles, engine lives the oil, no burning whatsoever, smooth start in the winter when temperatures can get close to the 30s occasionally and excellent performance on a scorching Texas days with 110f outside.I monitor oil temperature religiously and never seen it going above 235f and that is only when I’m pushing it pretty hard. Normal driving, the oil temperature stays at 220-225f which for twin turbo engine is very nice and low.As I said, I’ve tried practically every oil under the sky from all the best brands and none of them gave me all of the benefits at the same time like this oil. I’m puzzled how they were able to achieve such a great combination of durability, performance, longevity and broad temperature range. I’m changing my oil every 6-7.5k miles on my beast and this oil can definitely run longer on less aggressive setups and perhaps even on my engine too but I’m sticking to my intervals as you can see my engine is still running great at 275K miles and I have all intentions to get another 100k out of it :)

Works great for Polaris atvs/utvs!!! Way better than amsoil!! Machines run way smoother!!

I needed a higher quality oil for my modified TDI (VW Diesel) and I already run the S9000 5W-40 in my other TDI. That oil does a great job at protecting that engine, so I figured I would look and see what "racing" oil they offer for a turbocharged diesel and saw that they had this oil. After doing some research and comparing this oil with some of the others out there I decided to go with this oil. So far it's performed flawless during the car's first outing at a track day on the Road America course where there are some long straight stretches to open it up and pick up some speed, but it also increases the temperature of the exhaust gas, which was in the 1700 F range. The most I saw on the oil temperature gauge was 147 F which IMO is quite good. I will add that it was raining and in the lower 50's while we were out on the track, but I still don't think we'd have an issue with the oil temps if it was 90 F outside.

I have a Corvette that was built by a speed shop for HPDE events. The engine mods included bolt ons and a custom cam package. They recommended this 5-50 oil and I have had nothing but good experiences with it. The car sees over 7000 rpm a lot. 2 years strong now and no issues. Oil changes every 2500 miles.

Best oil brand on the market! Use this specific oil in my stump grinder engine. Two years hundreds of stumps and zero motor change from new.

I use this in my LS3 (king bearings with looser clearances) with LSA supercharger and some goodies. I was using 15w-50 M1, but decided to switch to Schaeffers 5w-50 after I read up on the additives, and I was sold by the HT/HS rating of this oil (5.1)! I live in the harsh desert of PHX, with summer temps over 110 regularly, and this oil holds better pressure vs the 15w-50 throughout the rpm range. I change my oil every 3k miles for peace of mind (due to heat and dust of PHX) so the 12 pack is convenient for me.

This is the best yet. I put this in my V10 M5 along with all my other Bmw's. This oil is smoother, and noticed a difference in performance just using it. It's a. It pricey but I see why.

Really like this oil. Only high zinc oil with a 5/50 weight. Can use this all year round in my highly modified truck.