Generally speaking , how would you rate these synthetic oils from lowest to highest NOACK ?
My guess would be :
I can run any of these oils but lowest NOACK appears to play nicer (i.e. intake deposits) in a DI engine.
This is just one brand (and a boutique one at that), but the NOACKs for the Amsoil SS line are conveniently available on a single PDS page...
IMHO, these results are all quite good.
If we mix in the non-"dexos1 Gen 2" grades, it's a little more confusing (quotes because these oils don't actually have that license)...
Still nice numbers all around...I have to assume that 5W50 beats 5W30 and 0W40 beats 0W30 and 0W20 due to different base oils, but I'm just guessing there. Interesting to note that the XW30s are not high HTHS oils, all around 3.1 for that test.