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Discussion Starter #1
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.
 

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LT. Dan
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6,817 Posts
synthetics of old used to not swell gaskets as well as dino oil. that has changed with time and tecnological advances. synthetics will only cause a leak if there is an exhisting leak.
 

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LT. Dan
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6,817 Posts
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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