Traveler brand 15-40 from Tractor Supply Co. in 5 gallon pails beats all of them, price-wise, and has the same API rating. Everything on the farm gets it- - - -cars, trucks tractors, lawn mowers, generators, pressure washer, and my Harley EVO soft tail.
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!