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Old 02-21-2002, 02:24 PM
rbauman rbauman is offline
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Join Date: May 2000
Location: Boise, Idaho
Posts: 80
another oil answer

Some time ago, synthetics would cause leaks because they would clean the insides of seals and gaskets. Most, if not all, synthetics today have seal swelling additive. Therefore, older engines which didn't receive close attention to oil change intervals often have a varnish/crud material on the interior of the gaskets and seals of engines, transmissions and etc. If one then changes to synthetics, the detergent action will clean the varnish/crud off the seals and two situations can occur; 1. after minor leaking, the swelling additive in the synthetic will reseal a good gasket and you're good. 2. After leaking, the synthetic oil will continue to leak thru damaged seals and gaskets and you have a problem. It's your call on this! LOL, Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k
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