I was walking through the local grocery store, which is part of a large nation wide chain, and I noticed in the very small auto section, they only carry straight 30 weight and straight 40 weight quarts, but what caught my eye is that all the bottles clearly said "NON DETERGENT" on the front. I would like to think they carry this stuff because it sells, but who's buying it????? Short of the pump on my pressure washer, nothing I own takes a straight weight non-detergent oil. I am sure there is the typical people that don't know any better that buy it, which I expect to happen...but is there something I am missing????? Does this stuff sell better than I think it does? My local walmart and auto parts stores don't even sell non detergent oil. I guess I have a source for it when I need it...but is there more of a need than I am realizing????