Oil Level and Fuel Economy - Toyota Yaris Forums

Yaris Hilton · 03-23-2010, 11:32 AM

Actual experimental data often misses some unrecognized variable. I remain skeptical that there's some "breakin" process that benefits the antiwear properties of oil.

Closest I can imagine for a plausible mechanism would be suspended sooty particulate matter holding the bearing surfaces apart when the engine's shut off and the liquid oil wedge goes away, and on startup rolling like little ball bearings till the oil wedge rebuilds and separates the sliding surfaces. That's the alleged principle of solid lubricants like graphite, "moly," and Teflon in oils. The sooty glop is generally held to be abrasive. Perhaps it's not always so?

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03-23-2010, 11:32 AM	#17
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Actual experimental data often misses some unrecognized variable. I remain skeptical that there's some "breakin" process that benefits the antiwear properties of oil. Closest I can imagine for a plausible mechanism would be suspended sooty particulate matter holding the bearing surfaces apart when the engine's shut off and the liquid oil wedge goes away, and on startup rolling like little ball bearings till the oil wedge rebuilds and separates the sliding surfaces. That's the alleged principle of solid lubricants like graphite, "moly," and Teflon in oils. The sooty glop is generally held to be abrasive. Perhaps it's not always so?