What is most likely to be the issue (or issues) with my car so I can take it into a mechanic and ask them to specifically check those things out? After getting an oil change on my car (infiniti j30 '97) I noticed the temperature of the engine gets abnormally hot after only a few minutes of driving. It does not over heat but the temperature gauge is indicating higher temperatures than normal. I suspect that the problem started before I got the oil change, I just noticed it after.
The engine seems to hesitate when I'm on the freeway. I don't take it on the freeway often but the last time I did, I noticed that once I got to my destination there was some smoke rising from the hood. The car is not actually mine but given to me by a family member and I'm not sure of it's maintenance history. With these symptoms is this more likely to be an issue with the engine or with the cooling system?