[M.D. Holloway]

I have had this in the back of my mind and it won't leave. I have had a bunch of customers whose gearboxes, hydraulics and air compressors run hotter than what they would want. They look for a solution and many oil companies will suggest using a thicker oil, but I have actually gone in the other direction and went thinner and they all end up running cooler. So why not apply that same idea to engines? By design, our engines run hot. I want to run a 15W40 instead of a 20W50. Problem is two fold - I just changed my oil 500 miles ago and 2) I'm a pussy - I know it won't F up my engine but I'm still a pussy.

Anybody use a 15W40? If not, anybody want to get involved in a case study? I will supply the oil you just have to provide some info.