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Reply to "Truly which synthetic brand of motor oil is the best?"

I saw a bit different result in a testing program .

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.