I use your heavy duty oil stabilizer in my 1997 Ford Ranger to reduce oil consumption. I just put remanufactured heads on it for a cracked head (common problem) and it turns out the valve guides are bad on one of the "new" heads. Well it was either pull them back off or give some Lucus a try. Before Lucus 1½ qts of oil used per 1000 miles after Lucus ½ qt per 1000 miles. Of all the other quick fix products out there yours is the only one that actually works, thanks.