The Mobil 0w-40 made both more horsepower on a engine dyno and had less amounts in particle counts in same engine , back to back testing vs Castrol SLX 0w-30 .
Not saying your wrong Callisa , just posting what I saw from another test .
That 0w-40 Mobil is really something else IMO . It meets both GM LL specs and the LL-01 .
Originally posted by Callisa:
Well, I have seen two engine having run on a dyno under same test conditions, one with Mobil 1 0W-40 and one with a german version of Castrol Syntec 0W-30.
Mobil 1 is good, but Castrol is (at least in this engine, within this test) clearly the winner. Better piston cleanliness, better wear performance.