if it were the oil pressure sending unit it wouldn't leak unless the car was running. look on the bottom of ur car and see if oil is torwards the rear of the car (or seems to be traveling with the winds direction). that means its leaking while ur driving, and how many times do u stop on 85 to see if ur leaving ne thing on the ground lol. does ur car have an oil cooler because if it does it could also be the oil filter base housing o-ring (the o-ring where the oil cooler meets the engine block) which would leak (alot!) while u were driving.