381K miles on my 2004 Corolla 1.8 engine with no work done internally on the engine. My rear main seal has been leaking for a long time. I replaced the leaking front seal a while ago and now I'm using less oil compared to before. I figured that I am using (mostly leaking from the rear main seal, but perhaps a little burning) 1 quart of synthetic 5w/30 oil every 3,111 miles. I want to know how this compares to others with a lot of miles on their car?