Back in 1992 we purchased a new 5 speed Eagle Summit Wagon (Mistubishi engine). I recall reading about the advantages of using synthetic. As I recall it was impossible/verry difficult to get a synthetic engine oil in Canada. I had a friend who regularly crossed the border at Windsor and I had him bring back M1. I used it for awhile but stopped because of the difficulty in supply. Although we had this car for 13 years it consumed...no devoured oil its whole life.