I love donaldson filters but has anyone used one of their endurance or endurance plus filters in a gasser? The endurance plus actually contain an additive ala fram high mileage, Calcium sulfonate (thickener/extreme pressure additive in grease?) mainly with some Diphenylamine (seal conditioner?). They are guaranteed for 60,000 miles but are not bypass filters I don't think. Pretty neat stuff expensive though.