Understand the Navistar engine.

Alright, time to clear up the horror stories on this engine.
1) NOT made for light hauls. If you use your brain, you'd notice it pulls better with 45k or more.
2) It IS NOT a high RPM engine. Read the manual, its not like a CAT where it can handle a heavy foot.
3) A lighter engine, notice how compact it is.
4) DOES NOT, I repeat, DOES NOT, like running hot. If the temp goes above 200, use the FAN OVERRIDE. It will also give an extra boost in pull.
5) Automatic Regen at 68mph or more. That's with a 10 speed, a 13 speed should Regen at idle.
6) REQUIRES frequent oil checks and fuel filters.
8) DO NOT, treat this engine like it can run forever without having 30 minutes to cool off after a LONG day. Maybe go inside, eat, shut it off.
9) Let the check engine light stop blinking BEFORE turning it over. Put the key in the 3 o'clock, let the check engine stop blinking. Turn it over, or else it can't test all the sensors and can result in PERMANENT engine damage.
10) This engine can endure a very heavy accel, this doesn't mean you can put it on the floor to take off. It can only take so much.

Navistar had to make this engine standard because CAT stoped making Cummins stopped supplying, and Detroit never made one to fit the mounts, I don't think.

There, giving Navistar's engine a good rep based on owning a truck with it.

 

RPM's, the plug needs to get a certain temperature to Regen. A 10 speed at 68 would get tht plug hot enough, a 13 speed would keep the RPM's down going that speed. Meaning a 13 speed needs to be allowed to go faster, but when a truck is in a 75mph zone... they have a truck speed posted.

 

AH! Better understanding.