I have an 04 GT with only 60k miles. The last 10k miles I've been running with a cooling issue I didn't have time to run down. I fixed it earlier this week. Flushed the coolant, new tstat, changed the air and fuel filters, plugs and wires. Ran a dose of techron through it. Car runs better than it has since I bought it with 30k miles. Actually, I'm amazed at how good it's running.
I'm wondering if I should go ahead and replace the O2 sensor while I'm at it all. It hasn't thrown any codes but given that it's been running lean for a while and the age of the car, would it be a total waste of time/money to go ahead and get it out of the way? If yes, any suggestions on brand?
While I'm here, anything else I should take care of looking ahead to the next 60k miles?
