It, the 75/90 gear oil, is going in the tractor rears and transmissions. Farmers are reporting less gear noise and easier shifting and cooler running. I'll take a farmers word on that. As far as the engine oil, it was just a question if anyone has used it? Even at around $8.00 a quart, it's not going in my cars, yet. But if good reports start coming in from everyday people, I'll consider it. Comes in 20/50 also. JMHO. PJ