If it works for you, keep on keepin' on! I use 15W-40 in everything on our place, cars, trucks, lawn mowers, tillers, generators, pressure washer, and even my Harley soft tail. Buying one kind of oil in 5-gallon pails from the farm store keeps life simple!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!