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.
Reviews of AMSOIL engine oil
1000 votes
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.
I use Amsoil in every vehicle with an engine that I own...this has not changed for 25 years. Amsoil is so good I'd pour it over pancakes if I ran out of syrup.
I'm using amsoil 5w30. Great product. Real synthetic. Superior protection.
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