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I have never seen a rear main seal leak in a fd, ever. The new thinner oil could have created an oil pan leak. I haven seen oil pans leak with 10w30 but not leak with 20w50. Could be several things though
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David Jerome
Broker for Speed For Sale LLC ( David@SpeedForSale.com)
(Pre-owned RX7/sports car sales & new parts sales/installs/tuning)
PM me about low priced, high quality port work 
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