Love hate relationship with my Mack.

Thanks. I might actually like this truck again. Now if I can only figure out why the oil temp is running hotter then normal. This had been going on since about April/may.

 

Over 70 mph, oil running about 235-240. I change oil every 20,000. Has 820,000 with 27,150 hours. (It's been a tanker truck almost all it's life). Couldn't answer the rod & bearings, only had it a year, but not since I've owned it.

The obvious answer is to slow down to under 70, but that's no fun.

 

I thought it might be the oil cooler, but I no oil in the coolant or vis versa. I do idle a lot for unloading and sleeping at night. I think I'll lower the oil changes to 15,000 and see if that helps.
Since in running across IN right now, I slowed down and oil is at 215-220°.

 

I can't get over how much better this truck runs. The low end torque makes a huge difference. I had a chance to pull a load Friday that had me at 79,780#. It's still not a C15, but I'm happy and don't have to constantly downshift to get it going.