Here I am just dumping in Amsoil 5W-50 SSO because all I care about is shear wear protection and something content with high temp operation. 20,000 miles and not even a single psi drop in compression the whole time, don't even premix.
I’ve used a few but the best for me is mopar oil filter and Valvoline full synthetic.
I've been using AMSoil 5W30 in my WRX since it was new (2003). Turbo is still good, and head gaskets lasted 17 years. I think it's worth the price.
I use Amsoil 0W20 but I’m a dealer. I have access to the test they run comparing it to Mobil and AC Delco stuff. The Amsoil is supposed to be better longer, but to me that comes down to your filter more than your oil.
Amsoil allegedly is the best. I use it in everything and no issues so far.
I’ve been using Valvoline full synthetic with a KN filter. Never had an issue
Valvoline full synthetic with max life tech is my current favorite but I think I might be able to unseat him soon.
Amsoil is top tier oil and you can't go wrong with it.
I’m using Amsoil 0w-30 and am very pleased with it. Getting about 1 mpg better gas mileage and had the Amsoil lab analyzed after 3500 miles and numbers are better than what the factory oil showed. All added up, the Amsoil was better at protecting the engine.
I personally use 5w50 valvoline fully synthetic racing oil for my r56 and change every 5000 km which is like around 3k miles and it's running good
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