Stock 87 GT. One quart every 600-700 miles! What is going on!? I just past SMOG with flying colors. Engine is not smoking (even at start-up). I went around the engine with a good flashlight...no leaks (little seepage around the oil pan but no drips). Only two possibilities that I can think of...Burn it, or leak it!
I pulled all 6 spark plugs, they have a normal tan color to them with no build-up. Valve guides replaced about 25k ago.
Im using regular 5-30 oil, not synthetic. Where is it going?