Have an oil leak and can't get to the cause
We'd all be guess on the location as well. Have someone local take a look at it on a lift to determine where it is leaking from.
what general areas do you see it?
If it's motor oil and you have the 3.8L V6 it's most likely the upper plenum. If you have that engine and the upper plenum and lower intake gaskets haven't been replaced yet that's the most likely suspect. Have both the upper plenum and lower intake gaskets replaced together if you decide to do it. HTH. -Jim
Looking for a Used Regal in your area?
CarGurus has 9,954 nationwide Regal listings starting at $2,500.
Search Buick Regal Questions
Buick Regal Experts
Related Models For Sale
Used Cars For Sale