I would still do a tip over drain or a regular drain and fill if possible. I would have to guess the engine would last a lot longer with fresh oil once in a while. These companies are in business to sell not make a product that lasts a lifetime. We are in somewhat of a throw away world and I would rather have things last a lot longer. John Deere has the quick change oil filter that has the oil added in the filter and you change that once per year. I guess I am just old school and change the oil and filter on my 22 hp JD riding tractor once per year. I like engines to last a long time.