So I'm definitely new to the older trucks. Have a 47 Loadmaster 2 Ton. The oil filter is the big canister style where you remove the lid and pull the filter out. I'm sure you all know what I'm talking about. I have a shop manual but it doesn't say anything about replacing this filter. Should I replace it on a regular basis like any other oil filter? I did see that I don't replace the air filter (oil bath). Just clean it and put it back. Thanks!