I have a 96FZJ 80. With 143K miles. Going through may be a quart of oil every thousand miles or so. My mechanic says I have a rear main seal leak. But I never see drips on the driveway. I thought I might have a bad head gasket or leaking through the valves or something but I never see blue smoke.My mechanic doesn’t think the engine is burning oil, but if I don’t see drips under the car, could it really be all coming out the rear main seal?