Installed a PML differential cover from Geno's garage. It called for 20 ft. lbs torgue. Used the factory gasket for the second time with no leaks. PMl is a well made cover with the filer,level and magnetic drain.
The first time in changing the cover to change the lube, the 30 foot lbs. torque seemed too much. PML's instructions seemed more correct. Its possible that one might have to use a new replacement cover if the reusable one is used too much, also Permatex gasket maker 26B has been advocated as an alternate sealer.