Originally Posted By: JHZR2
Originally Posted By: ARCOgraphite
MTD/WHITE (mfg: Olympic Oil Co.) Winter 5w30 API SH (high ZDDP). Runs great, Virtually no scent or color to the virgin oil. Found it at Lowes in the Snowblower Parts Aisle. I have to run and post a VOA someday. You really want to try a retro high-ZDDP 5w30 dont you?
Other than that, for penny pinchers, Formula Shell 5w30 SM is the least problematic conventional I've run in the past decade.
Seriously? API rating aside, how do we know it is up to snuff for automotive engines?
Is a aircooled tractor/ODE engine with NO oil pump a tougher environment than a water cooled pressure lubed engine? Is Briggs and MTD picky about their OEM oil? Otherwise, given that the oil is clear and virtually scentless it's at least a group II+ "purebase". MTD/Briggs high lubricant stds typically require 1200-1600PPM ZDDP.
To directly answer your query, We cannot prove suitability without running API cert tests (not happening) or at least a few voa/uoa. Butr we can assume suitability. It is by all indicators a suspected good oil but with BOOSTED EP/AW additisation. IN service. my Toyota never ran better on any oil, regardless of price, including M1 AFE and M1 10w-30HM. Smoothness and lack of engine noise are "1st line of defense" indicators of oil quality.
Then note All those engine failures on SG/SH oils in the past. Like I said I gotta get a VOA but I cannot trust B-Stoned these days.