I dont really know a lot about
oil, only that mineral oils doesnt handle the heat the same as
synthetic. I have used Castrol RS 10W60, and found it good in racing vehicles, and have seen tests where it has out performed Mobil 1, Castrol RS is based on Mineral
oil with something like 20% esters. Now if you want a really top performing
oil that will do a substantial road mileage Motul
synthetic and it 100%
synthetic derived from coconut oil.
You pay for what you get, if you have a valuable engine spend a few dollars I reckon its cheap on some good oil if it makes the engine rev better and last a bit longer it will be worth it.
Motul 300V Competition 15w-50 in the comparison I have it out performs,
Castrol RS 10W-60
Mobil 1 15w-50
Red Line 15w-50
Total Activa 10w-50
The test is done using Friction Cameron Plint, HTHS, Shear Stability, Wear Cameron Plint, Oxidation Stability and Noack Volatility.
I reckon if you mentioned this test to
Amsoil they would say their oil is better, as they alway have the best oil technology .............!