I have never used anything but Amsoil in my LB7 Duramax for 12 years. It has almost 350,000 miles on it. I use Amsoil in everything from the weedeater right on up to the Duramax. Never one issue, and I only change it about every 20,000 miles.
I keep using AMSoil after seeing a test results sheet from Blackstone (i think thats the labs name) for my 6.0. Tested after 15k miles and was better than 400 mile motorcraft.
Castrol Edge Extended Performance, 5w30
Mine uses Castrol I believe.
Amsoil Signature Series is all I have ever used, I will recommend it.
My preferred is Amsoil 10w30, the good stuff. Seem to burn less of it off when driving hard.
I use the 5W-40 in my e46.
Castrol semi synthetic Actevo for my F800st.
I've always been a Castrol man for my BMW car.
I used some castrol 5w50 at my last race. Oil temps saw like 270F.
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