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Re: Differential Cover Sealing and Synthetic Fluid
Posted to Technical Discussion Forum on 4/25/2012

Silicone sealants are not compatible with synthetic gear lube and do break down to cause leaks. However there are sealants specifically designed to work with synthetic fluids and have no issues.

I've used GMS and Mobil 1 synthetic gear lube for the rear diff... Login to read more.