Do Cobalt Usually Leak Oil?
Hello, my fiancÚ has a 2007 cobalt (she bought new) that she has let her sister borrow for the last year. Her sister lives about 4 hours away so we don't really get to see the car too often. I have a feeling that her sister doesn't really take good car of the car or get routine maintenance done on it. We are going to visit with her sister in a couple months and I wanted to change the oil myself and put a good quality oil in it (like Pennzoil platinum high mileage) that will last a little longer and hold up to the short drives that her sister does. Now, I know a little bit about oil but I'm not an expert. I know that you can go from dyno to synthetic to dyno with no problems. People say you shouldn't use synthetic after so many miles of dyno oil and its simply untrue. The reason why there is a misconception about that is because quality synthetic oil cleans the sludge and deposits in a dirty engine and sometimes the sludge is the only thing keeping it from leaking. So since I don't get to see this car very often I am a little concerned about the car developing a leak after the sludge is cleaned from the crevices and I wont be there to spot it. My finance didn't take the greatest care of the car and didn't use a quality oil so I'd like to use something good that will clean up the engine. Anywho, my main question is; are these cars prone to oil leaks?
Edit: car has approximately 120,000 miles on it.