I just switched to synthetic oil a few months ago, and when I went to get my state inspection, the mechanic said that he saw a rear main leak...wanted to charge me $250 to fix...should I get this fixed?...will the leak stop eventually? I responded to this thread in the "General" forum, but thought I might get better/more responses here...below is the quote from another poster about this being related to the syth oil switch...
Originally Posted by osburn
1996 GRAND CHEROKEE LAREDO I6 BONE STOCK (SO FAR!)
1997 FORD EXPEDITION EB
Originally Posted by slaterny
Switching from "normal" to synthetic oil. After any engine have been running for some time, lube oil will carbonize on surfaces and give a "perfect" tolerance (fit). Switching to synthetic will clean the engine. In other words you will loose the perfect fit, and you will have leaks. These leaks may disappear after a while as the new oil starts the same carbonizing process. But in your case, I would not count on it. Just because oil does not easily carbonize at either end of the crankshaft (if at all). We, that open up engines from time to time, can easily see if an engine has been running on "normal" or synthetic oil. It is quite a difference. My GC has been running 110K since day one on synthetic, I will not take the chance on switching to "normal" oil.
Happy with this response?
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