I like Amsoil. A lot of guys swear by Shell Rotella T6.
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.
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 run Amsoil small engine oil in my 2000 inverter.
Amsoil since day one, never let me down and improves mileage as well.
Amsoil Signature 5w-30
It’s probably placebo but I feel that I burn less with Amsoil. That said with current prices I’ve gone back to my default of Castrol.
O-w20 amsoil is top notch, expensive but worth it.
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