I like the Fleet Charge from Tractor Supply. Had it going on a year and a half and SCA's seem to be holding true. I did have to add to it a couple of times though due to heater core replacements, so that probably helped. I will flush and fill this spring. I also don't drive my truck much, but when driven, it usually is pulling a load, but if I drove it more, it would probably be a different story SCA wise.