I have added a bottle of Lucas Heavy Duty Oil Stabilizer everytime I have changed the oil every 5,000 miles with conventional oil. The engine still purrs like a kitten with close to 65,000 miles on it. I can't wait to switch to Mobil 1 Extended Performance Oil and Lucas Synthetic Oil Stabilizer to extend my oil change intervals.

I also use Lucas Heavy Duty Oil Stabilizer in my van's rear diff.

In addition, I have used the Transmission Fix in an old car of mine that had tranny noises and they went away.

Jay R.

Florida