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 use Liqui-Moly Special Tec 5w30 in my 328i
I use LiquiMoly 2332, it’s a 5W-40. Works great for me.
Mobil1 Truck and SUV 0W-20 or Liqui Moly Special Tec 0W-20. I've noticed that Liqui Moly really quiets the valvetrain down. 2016 GX460.
I walnut blasted my intake ports and valves at 44K miles, myself. The intake portsand valves were not too bad, but there was definitely buildup on them and was glad i cleaned them.
I run Amsoil small engine oil in my 2000 inverter.
Amsoil since day one, never let me down and improves mileage as well.
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