kohler command pro 10w30 or 10w50?

[z71bill]

I use Mobil 1 Turbo Diesel Truck 5w40 in my 18HP JD garden tractor. 25 abusive years down the road, the thing still runs perfectly, uses no oil and will outlive me.

I use Mobil 1 15W-50 in my gas powered generators.

As I've mentioned here before, the use of adequate viscosity in air cooled engines is a must in high temp environments, especially when oil temp is not well controlled. I regularly saw oil temps above 270ºF. That's too much for 5W-30.

Does thicker oil impact oil temperature?

I would say yes- thicker oil increases friction and that increases temperature - your solution may be part of the problem.

To many variables to say but it would be a nice test if someone could set it up.

 

[kschachn]

I use Mobil 1 Turbo Diesel Truck 5w40 in my 18HP JD garden tractor. 25 abusive years down the road, the thing still runs perfectly, uses no oil and will outlive me.

I use Mobil 1 15W-50 in my gas powered generators.

As I've mentioned here before, the use of adequate viscosity in air cooled engines is a must in high temp environments, especially when oil temp is not well controlled. I regularly saw oil temps above 270ºF. That's too much for 5W-30.

I’ve always remembered your posts on this subject.

 

[Jmoney7269]

Im not sure if that stuff is diesel rated. Does it have a diesel rating on the api donut? Kawasaki oil may not even have an api donut

Yes its api cj4 rated. This is the oil we used in all kawasaki diesel mules