like the title states my 98GT stock. is DRINKING oil! like bad. just went outside and checked it and there was barely any on the stick. i added about a half quart but yeah it wont last long @ all. im using Mobil 1 Synthetic 10W-30 high mileage now. car only has 80,000 miles on it but since its been drinking oil then i figured id try high mileage, but with NO luck. anyone know what could be causing this? thanks