Assuming the engine hasn't been swapped out, I'd start by doing my own oil change. I'd drain the oil and put on a new filter. Buy your oil in quart containers. Pour in 4 quarts and check the level on the dip stick (it should read 1 quart low before starting the engine). Start and idle the engine for a few minutes. Let the oil drain back and recheck the stick. The stick should read a little below the add 1 quart mark. Now you can add the final quart and check to see where the full level is on the stick. If the engine/dipstick/pan are stock, you'll know what your oil level is. If the final oil level is above the full mark, you can re-mark your dipstick with a file (or try to find a dipstick that matches your engine).
Even at 80k and a heavy foot on the throttle you shouldn't use/lose that much oil. Try cruising at 60 or so and back off on the throttle. If you have tired valve stem seals, you'll get a puff of smoke out the exhaust that will be visible in your mirrors.
Even at 80k and a heavy foot on the throttle you shouldn't use/lose that much oil. Try cruising at 60 or so and back off on the throttle. If you have tired valve stem seals, you'll get a puff of smoke out the exhaust that will be visible in your mirrors.
