I just put a new O2 in the car about 30 miles ago and I am planning on running a bit of ATF through the motor to check for additional exhaust leaks (found one at the turbo that's loud enough that I can't hear any others). The motor has about 5K on a rebuild so I don't think I need to buy top engine cleaner I just need a little smoke . I think I still have the old O2 but I'm lazy and wont change it unless I have to. thanks.
bob
bob