Doughful. M1 has left stains. Granted no sludge or heavy varnish. I likes me shiny metal. I’ve thought about trying their OE line with the same intervals. I love their other products as well. My Sthil combi loves their Saber oil at 100:1. Been screaming along for the past 6 years.You’d have the same result with any off the shelf oil at that low of a mileage. That’s what makes it a scam