I am hoping to be able to go into my mechanic armed with a little information (not "loaded for bear" but informed). I picked up my '98 V70 awd this morning after having had a tune-up done (distributor, car, wires) and I had the timing belt done about a week ago. I drove about 20 miles and got up to about 80 on the freeway and went home. About 20 minutes later, when I backed out of the driveway, I noticed a fair amount of oil on the ground (there had not been an oil leak before I brought it in. I suppose I am wondering if it is fair to expect the mechanic to repair, at no charge, a leak that wasn't there when I brought the car in, or whether it is likely that I could have just coincidentally sprung a new leak within 20 miles of picking the car up. Again, I'm just trying to figure how to approach this with the mechanic.

Thanks!