Rotella 15w40

80fbody said

There's plenty of data out there. Bob's the oil guy, etc. Rotella has as much zinc as most shelf street (non-race) oils. I've never had a bearing, lifter or any other type of issue that would be considered "oil related" and the motor's always look good if you take them apart. Race car will be a different story. Everyone has their preference. It's worked well for me, even on air-cooled motorcycles in the heat of summer.

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a point of observation (not intending to contradict yellowrose, or anyone)
Is that there have been knuckle heads that have replaced their oil with automatic transmission fluid and driven for weeks or months...”I never had any problems running X, Y, Z motor oil whether for diesel, or nonsynthetic, or whatever oil doesn’t represent but a sliver of real estate.

those previous mentioned knuckle heads with automatic transmission fluid in their didn’t have any initial problems either.

what we all understand is the rate of wear regarding particular oil, rings, machine-finishes is the REAL question

and without SCIENTIFIC data, personal experience,

unless you basically are a race team or can measure cylinder bore wear with a measurable method of oil use

-is just a shot in the dark, it isn’t significant evidence.