Everything on my farm runs 15W-40, from the tractor to the lawn mower, and all the cars. It makes things really simple, and 5-gallon cans of the stuff cost lots less per ounce than buying quarts of some mythical mouse milk. No problems for the past 20-something years.
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!