Ken Hilson wrote:

> So question is does the rear seal leaking usually cause a drop in pressure

No, it will not cause a drop in pressure. The front and rear main seals
on American v8 and v6 engines (and all engines that I know of) are not
exposed to oil gallery pressure, just splash and spray from the front
and rear main bearings. You could remove the seals and run the engine,
and it should have normal oil pressure (at least until all the oil
sprayed out after a while... ;-)