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.
Using penzoil ultra platinum 5w30…cheap and has been great!
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.
Pennzoil 10W30 full synthetic oil was perfect for my S2000 in CA 0 issues it's also very cheap
South Florida, 2010 GX460 @ 90k miles. I use Pennzoil Ultra Platinum 5w30 year round and either a Wix or OEM filter.
Sounds very nice.
I've run penzoil ultra platinum 5w30 for the last two oil changes. It's great, but running the heavier grade oil I notice the engine is a little sluggish until it's been running for something like 10 minutes, so my next oil change im gonna go back to 0w20 and stick with penzoil ultra platinum because it seems to run cleaner than the valvoline oil I ran before.
I run Amsoil small engine oil in my 2000 inverter.
I do penzoil. Amsoil is good stuff too, penzoil is just easier to find. I do the ultra platinum. And I use wix filter (black one because it has the same valve the oem filters have).
Amsoil since day one, never let me down and improves mileage as well.
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