I had white smoke (anti-freeze) coming out of the exhaust last winter so I put a can of Bar's stop leak in and it fixed the problem. I made the mistake of driving the car on the highway (first time since stop leak fix) several times at speeds of 75 to 80 on hot summer days
. Just so happens that I was due for an inspection sticker so I went to the repair shop. It failed the emission test
I then noticed later the white smoke was back. I put in another can of Bar's stop leak and it worked again
I need to bring the car back in for reinspection but I'm not sure if the motor has been contaminated (egr valve, oxygen sensor etc...) I need to know if this was the reason for the emission failure and if it will pass now??? This car has only 57,000 miles on it and is in good shape.