Older engines which didn't receive close attention to oil change intervals often have a varnishing/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 varnishing/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! Roger (edited 11282001)

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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k