Originally Posted By: Speak2Mountain
My DI 2.5 V6 from Toyota sheared PP 5w30 to 20 in 3100 miles, according to Blackstone Labs.
Blackstone also reported: 98% of add pack still left and could prolly go to 5K easily.
How does Blackstone make a statement of % add pack remaining? I've never seen them account for additives that disappear out the tailpipe. Typically additive compounds based on moly, boron, zinc, etc. maintains their concentrations no matter how low the TBN gets. ... Seems weird.
Back to the actual subject, permanent VII shear (broken molecules), I have a crazy theory: New engines, with more sharp surface asperities and iron particles under 10 microns in size running around, shear oil more. I think I've observed UOA's with new engines having more shear. Also turbo'ed engines are rougher on oil and show more shear. Maybe my observations of new vs. broken-in engines are off, but its consistent with the way VII's die: more stress.
My DI 2.5 V6 from Toyota sheared PP 5w30 to 20 in 3100 miles, according to Blackstone Labs.
Blackstone also reported: 98% of add pack still left and could prolly go to 5K easily.
How does Blackstone make a statement of % add pack remaining? I've never seen them account for additives that disappear out the tailpipe. Typically additive compounds based on moly, boron, zinc, etc. maintains their concentrations no matter how low the TBN gets. ... Seems weird.
Back to the actual subject, permanent VII shear (broken molecules), I have a crazy theory: New engines, with more sharp surface asperities and iron particles under 10 microns in size running around, shear oil more. I think I've observed UOA's with new engines having more shear. Also turbo'ed engines are rougher on oil and show more shear. Maybe my observations of new vs. broken-in engines are off, but its consistent with the way VII's die: more stress.