I have had my 01 chev d. now for 2yrs,bought it used.It has 129k on it.do not know what kind of oil was used b4 I got it,have been using 15/40 reg oil. Have read if start to us it with this many miles may cause a oil leak.was wondering what you'all thank.
definatly, lots of people switch to synthetics at high mileage. like i said if there is a exhisting leak somewhere it could possibly be enhanced due to the synthetic oil makeing its way through the hole.
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