thanks for the welcome. I did not pay too much attention at the time as I thought it would be a routine job and would be good to go, so I am unsure of the specifics of the repair. The invoice does not show any charge for diff. fluid. The garage I had the work done at is recommended and affiliated with AAA. The mechanic I talked to today felt it had been drained because there was a washer missing from the drain plug and there was no evidence of leaking anywhere. How long could this car go on roughly 1cup( what was drained today) of diff. fluid.