Well the syn oil is a little thinner and leak easier. So if the seals are marginal it may leak with the syn. Rear crank seal leak? That is unusual. How many miles on the engine?
I assume you are using Mobil 1 syn? I think it is the most compatable with the rubber gaskets.
Also, driving the piss out your SVX will make it run hotter and cause the seals to leak.
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