I was told to run nondetergent oil in my 1952 Cushman Eagle engine (single cylinder, flat head, four stroke, 18 Cubic Inch, upright, horizantal shaft) because it does not have an oil filter. Can anyone steer me in the right direction to figure out if a modern oil could be used? I was told that the detergent oils kept the particles in suspension so the filter could take them out and that in a non detergent oil the particles fall out and stay out of harms way in the sump until removed at oil change.
Any truth to this or can I just use a good synthetic?
Any truth to this or can I just use a good synthetic?