While I might take my car in to a place that does oil changes in order to get my oil changed every few months, I don’t have to take my boat in to have the oil changed on my two-stroke outboard engine. I just have to have oil to keep the tank full and I am good to go.
To make this even more affordable, I split the cost of a Mercury oil 55 gallon drum with a couple of my friends every few years. We all use the oil during the years that we have each drum and pay proportionately for the amount of oil that we use. So far it has been a good way to save us money in the long run.