We have 3 oil leaks in our 97 Camry LE. We are getting an estimate tomorrow on how much it will cost to fix these. We have had them for about 4 years, but they are starting to leave stains on the driveway. What causes these oil leaks? What should we expect to pay for the repairs? We don't want to get "taken" because we don't know much. Thank you!

Drove my wife's car yesterday and felt/heard groan in the rear brakes. Took the driver side wheel off, looked for uneven wear, all springs etc connected, made sure cyclinder pushed in both directions (with the engine running - front side extendes first and backs off last, but it does extend both ways) and then cleaned it with brake spray, let it dry and put it back together. The wheel seemed a little tough to get off and even tougher to get back on - the drum was definitely not clearing the shoes. Might have been that way coming off but pulling off is easier than pushing back on? Anyway, I saw no uneven wear (although I don't have the stuff to really measure). But that wheel definitely has brakes applied, maybe both. The parking brake is not the culprit, it hasn't stayed engaged in a couple years, and I did pull the lever to release just in case I went into the twilight zone engaged it in some fashion. Where do I go from here?