Re: A very old question but here goes
Dave,
I have been using 10W-30 or 5W-30 regular Mobil 1 since I bought mine with about 30,000 miles back in 2000. Since about a year ago I have been adding 1/2 bottle of ZDDP (2 ozs) per change.
She just turned 120,000 and no issue.
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