There is 70K miles on the vehicle, I got her with 57K a year ago.I noticed I was loseing a Quart of oil every 5K miles and read this additive help this problem. No smell of any anti freeze out of tailpipe.I change the oil every 5K miles with Mobil 1. Compression is strong, It seems to run better after the treatment but now have the smoke problem.Don't see any lost anti freeze in over flow.