Most, or nearly all of the Volvo units run on automatic transmission fluid, which you had better get out before it mixes with the 30 ND oil in your transmission. That means replacing the OD filer as well. The ATF is actually better and gives them a longer life. Additionally, most Volvo owners actually service and take care of their cars, so you have a better chance of picking one up that has had the filter changed several times over the life of the car. These cars are usually not run hard or abused either.