The car is leaking oil pretty bad. About 1/2 quart every 3 days or so. I can't see exactly where its coming from but its not the oil pan. Also, whenever I hit the brakes after the car is warmed up the oil pressure goes flat and the dash beeps ( its getting very annoying ). Is this the rear main seal? Or could it be something else. Thanks guys

 

might be the seal, why don't you get under the car and look, sounds like you're running the engine low on oil if the preasure drops when you get on the brakes.

 

Take it to the quarter car wash, soak it down with Gunk Engine Bright or some other brand of diesel fuel in a spray can, clean it up, see where the oil is leaking from, and fix it.