Just bought a 2004 Subaru Outback. Has 13,000 miles on it. I did not get a manual or a Warranty Owners Manual which, I believe outlines the scheduled service. I have little or no idea of it's previous service history. The oil doesn't look too bad-I think the oil filter is a Subaru issue, it's a black filter w/Japanese writing-. I checked the air filter…it's in pretty bad shape-appears to be OEM, it's made of yellow paper, and was partially eroded-directly by the intake area. Should I assume that this car has not had any service since new-if so what would you guys recommend? All other fluids look good, coolant, brake fluid, power steering etc. Also, is it time for a tune up? i.e. plugs wires etc? Thanks in advance.