The SM oil certification requires a successful test of the oil brand at a 300 deg oil temperature sustained for a continuous 24 hour period under load. The bearings are then checked for wear. If there is no wear or wear is minimal, then the oil gets certified SM.
__________________
"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
|