Doug,
I run 5w -30 in all my cars and my Service Vans ... Synthetic of course ... change it every 3500 - 5000 miles .. I have ford triton v8's in service vans that are known to fail because of oiling issues ... and knock on wood they are in the 130k - 150k mile range. I will agree oil leaks are more common due to the light wieght oil and some say due to the composition of the synthetic motor oil lacks what conventional oil has ?
Ron
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