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Originally Posted by lewdog
That's interesting. Never heard of that but I suppose makes sense.
I assume with the low miles this guy was just doing oil changes about every 6 months regardless of miles?
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Like I said that was just a thought that popped into my head for some reason after seeing the oil change interval. May be nothing like MIA is saying but I did a quick Google search and found this which is kind of along the lines of what I was thinking.
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Generally, there is a parabolic curve that is associated with wear rates. The are slightly higher initially, drop down to nearly nothing, and then escalate again after the oil is compromised past its point to deal with contamination.
The “uptick” in wear is due to the tribochemical barrier being removed by the “fresh” detergent package upon installation. Yes - believe it or not, too much of a good thing is a bad thing. Now, DO NOT read too much into this; I’m not saying it will kill any engine. But what I am explaining, and what is abundantly clear in UOA data as well as supported directly with the SAE article, is that the wear is HIGHER upon the initial OCI, because the cleaning additives actually remove the boundary layer that protects the metal parts. Don’t believe me? Read the whole article. And review my “normalcy” article as well; there is CLEAR data that shows the wear rates drop the further out you get from an OCI event."
I haven’t seen the SAE article, but it seems to be based on used oil analysis, showing metal particle content.
I posted there once suggesting that since UOA is an indirect way of measuring wear perhaps something else is going on.
I think it’s possible the rapid increase of metal particles in fresh oil comes from being “washed off” of various surfaces in the engine, not from increased wear.
Of course my idea didn’t get a warm reception.
I think the only way to conclusively show the short OCI’s increase wear would be to run two or more engines under identical conditions but different OCI’s, tear them down and measure the wear.
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OCI means "oil change interval" I am pretty sure.