regarding15/40 oil
we have a 1986 new yorker with a 2. 5 4 cyl in it . we've had it since 1994 and have put approximently 250,000 kilometers on it(about 140,000 miles) on it, and all it has ever had in it is 15/40 oil. penzoil for about 8 years and walymart 15/40 for the last 5 years approximently. had the pan off last year due to the car going airborne while my son was driveing it to install a brand new pan. the inside of the moter was spotless and had no sludge in the pan at all. the car had 65000 kilometers on it when we bought it in 94. still going strong at 200,000 miles.
dodgeboykim