Amsoil Engine Tear Down Pics

Not in service, but a pretty demanding test.

View attachment 153029
Hmmm.



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That basically just says it produces less piston deposits better than some other oils ... but still produces piston deposits in the specified ILSAC Sequence IIIG deposits test. "Keeps pistons cleaner" is the key phrase.

Valvoline Restore however claims it will actually remove existing piston deposits, and that's what the Valvoline engineer in LSJ's video said they saw in the Sequence IIIG testing.
 
SS 5W-30 = 10.3 cSt / 6.7% Noack / ~8% ester
XL 5W-30 = 11.3 cSt / 9.4% Noack / no ester
OE 5W-30 = 11.0 cSt / 9.4% Noack / no ester

It's likely the base oil viscosity of the SS 5W-30 is as viscous or more viscous than the XL and OE 5W-30 with less VII load thanks to better quality base oils. I'd rather have an oil that starts at 10.3 and ends at 10.0 than one that starts at 11.0 and ends at 9.5.

230°F is a normal sump temp. It's typical of engine oil to operate at +20-40°F above coolant temp. Nothing concerning there. Especially a top shelf synthetic like SS, it could hum at 260°F and be fine.

That’s why I asked, I wanted to know why SS 5w-30 was thinner than extended life ore OE
 
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