This is a friends van. It took a nice long 3k mile trip up to NS Canada this past spring. So most of this mileage has been that and highway around here. This was AMSOIL OE 5w-30. It states that grade on the oil cap but I wonder if I could run 5w-20? Oil filter was an EaO15k02. It isn't low on coolant so not sure what is up and this is the third round of OE. I have been changing it every 5k miles.