This car has 136,000 miles and I changed everything that comes along with a tuneup.
my car seems to be losing oil and there are no leaks. what can be the issue? on 1996 Nissan Sentra
You must be burning oil because of sticking or worn piston rings or loose valve guides and/or guide seals. Possible that PCV is worn out and you could lose a little oil that way too. You didn't mention how much oil you use.