I use Rotella-T 15w40 in everything I own, car, truck, tractors, everything with a motor, EXCEPT my 2006 Harley motorcycle. I use HD synthetic in it because I love keeping my Harley all original, down to the oil. Rotella-T currently sells for $79 for a 5-gallon container at Walmart. That's $3.95 per quart. I run it in 2 John Deere D140 lawn mowers with B&S Intek V-twins with almost 400 hours on each, all my Polaris ATV's, Kubota X1100C diesel UTV, 2003 Kubota M9000 tractor, 2000 NH TC33D tractor, 1968 Ford 3000 tractor, all diesels, 2004 Chevy 2500HD 122,000 miles, 2001 Impala 227,000 miles, both with gasoline engines, Generac 6500 watt generator, Generac 150kw stationary backup generator with Ford V-10 engine, Craftsman power washer with B&S engine, 4 push mowers, most with B&S engines, and probably some other machine I've forgotten. I started using Rotella-T 15w40 in my Ford 3000 tractor after a complete engine overhaul in 1982. That tractor today has over 3200 hours on the engine, hard hours, high rpm, 6-8 hours at a time, etc. It has never used any oil since overhaul. I recently had to pull an injector that got some debris in the nozzle. While I had it out, I put a scope in the cylinder to see what it looked like. It's been 41 years since the overhaul and there is no ring ridge, no sign of wear, compression right on the spec. The engine has never used any oil between yearly oil changes, None of my engines have ever needed any oil added except the 2001 Impala. I did not own it for the first 178,000 miles so don't know the history on it before that. I bought it in 2012. It uses about half a quart between changes (3000 miles) but most of that is found on my shop floor from an oil pan gasket leak. Almost impossible to change that gasket, so I let it leak. That's been my experience, and I have never had ANY oil-related engine issues whatsoever since I started using it 40+ years ago. Go ahead and scream at me that it's not supposed to be used in gasoline engines, that it's made for diesel engines. I use it because of the results and will continue to buy it 5-gallons at a time. I've actually considered buying it in the 55-gallon drums at Sam's, but the problems handling it is why I don't.