If you don't have any confidence in the shop, tell them to either give you your money back, or pay to have it done at a shop you trust. Clearly, they jacked this one up. Also, pretty much every shop out there has a 1 year replacement warranty on all work they do.
- No, there's nowhere else coolant can come into contact with the oil. That should never occur. Sometimes, if your vehicle is used frequently for short driving trips and does not reach operating temp. you can have some slight condensation build up on the oil cap. But it should not be coolant.
If you take the cap off your coolant reservoir, and let your engine idle, do you see bubbles coming up in the expansion tank?
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