Getting ready to put new2me 48-3609 on the road. Its without a oilfilter and was last plated in 1976 showing a 6-76 marathon oil change sticker on the jamb indicating 10-20 oil was used. 10-20 oil then would be detergent? Without a filter i'd be inclined to use nondetergent. I pulled dipstick and oil looks new, without any fuel smell. I'm gonna warm up and drain tomorrow and looking for comments not arguments about what u'd do. thanks.