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I bought mine ('01) last August. Had a receipt from an indy garage that said that it had a synthetic oil change 500 mi before. Not being sure what oil or grade was used, I changed it last week at approx 3000 mi. Put in Mobile 1, 0-40. I will probably drive it 4-5K annually and am planning to change the oil each 10K or so or 2yrs whichever comes first.
More frequent may be even better, but there's a diminshing returns factor here, and as a retiree who does not own Mobile stock, I have to draw the line at practicality.
bob
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