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Reply to "How to Select Motor Oil"

hwhite1,

I’ve been using Mobil 1 for extended service intervals in 3 of my personal cars for the last 9 years. Recently, I changed the oil and filter at 164,000 miles where the last filter change was at 115,000 miles and the oil sometime before that. This was pretty much by neglect. It should have been about 25,000 miles on the oil alone. I have attempted to change the filter every 7500 miles.

I discovered this message board while searching for an oil analysis for this last oil change. I am concerned about the wear on oil that is used for over 49K miles. An interesting book titled “Synthetic Automotive Engine Oils” (PT-22 SAE ISBN 0-89883-110-5) provides some insight to extended service intervals.

There may be much better info on this site and elsewhere oin the web, but this is my 2 cents worth.

-colortvset
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