When people are initially most dissapointed with extended OCI's...............

[Tim]

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Originally posted by ekpolk:
One thing to add to Pablo's original thought: I'm not sure that many folks really appreciate how much oil stays behind at change time. In the Toyota Camry (my previous vehicle), the owner's manual advertises two fill figures, for changes with and without filter changes. The service manual, however lists a third: oil fill amount after complete engine disassembly and reassembly. That figure, 5.8 qts for the V-6 IIRC, is almost a full quart above the normal oil and filter change figure.

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Very good point.

And not only does it affect inital attempts at longer OCI, it also skews the results of shorter OCIs in such a way as to make it appear that you get more wear per thousand miles at say 2,000 miles than you do at 4,000. That quart of dirty oil may take four quarts of virgin with zero iron and make it look like it has 3ppm after a hundred miles! I believe this dirty oil carry-over is responsible for much of the "wear spike" folks report on short OCIs. I have done several short OCIs on two vehicles (recently) and then followed with an analysis at 2-3,000 miles and found extremely low to non-measurable wear metals.

Tim