I currently drive a 1992 Nissan Sentra with 125,000 miles. About a monthago, the transmission started slipping really bad. I barely made it home and was thinking the entire time about paying for a new transmission. I normally use Heavy Duty oil stabilizer in my oil changes, so decided to change gear oil as a last resort, but included a quart of Lucas oil with it. After test driving it on the highway, it seemed as if the gear slip fixed itself and I've driven 1000 miles since and haven't had any problems. I'm a believer in Lucas Oil.