If I were to buy a truck that did not have a filter I doubt I would add one,I would drop the pan and remove the valve and side covers to make sure its clean and then change the oil every 1000 to 1500 miles,not to sound like a tightwad but the filter I get for my 37 is getting close to 15 dollars now and just not worth it for how little it does and how little I drive it.
