2014 D13 Oil temp.

That does sound a little high - but I’m not familiar with the engine.

 

Its normal. We had 2013-14 D13 that always ran in the 240-246 range. I thought it was high in a 2013 and I called my buddy in a 2014 and his was the same. Probably due to the regen system. I'd run a 10-30 oil to produce less soot if I were you. We had cam issues running 15-40 due to soot loading on the rocker shafts getting the valvetrain geometry out of whack.

 

I treated mine well. Except for a lobe on the camshaft messing up and replacing the cam, everything on that motor was original at 660k when it was sold. Turbo, injectors, clutch, dpf/egr system was all original. All that was changed in that time was NOX sensors, doser injector cleaned, dpf cleaned twice, overheads every 250k. One belt tensioner replaced along with two oil pressure sensors. Good motor that was 7.5-8+ mpg and reliable.

 

Yes, Thermal breakdown/oxidation starts from 240-250 degrees for petroleum based oils, from 275 degrees for synthetics.

"What is thermal breakdown?
What happens when a car's engine gets too hot? Well, lots of things, and none of 'em good. Thermal breakdown is among the most damaging effects, and occurs when a car's internal heat causes a chemical reaction in the motor oil, which causes the oil's viscosity to change. Basically, if (or more accurately, when) the engine heats up beyond a certain temperature threshold, the motor oil will start to degrade.
What is thermal breakdown?

 

240-250° in summer or pulling is normal on newer models D13

Light load 220-240.

Highly recommend synthetic motor oil in emissions engines, they run much hotter than pre emissions trucks.

At minimum a semi-synthetic oil.

This is one of the biggest reasons why CK-4 and FA-4 oils were developed.... Higher temperature protection and more lubricant efficiency...less friction on moving parts with less pumping loses..


.

 

Define cam issues. Cam ruined / unusable?

 

Yes Dave, they will wear off the hard facing from lack of lubrication like the ISX does.

This problem is commonly due to running a 15W-40 motor oil, which trades off oil flow for [oil pressure] and that causes soot to start packing the head full..... Which results and even less oil flow and a downward spiral of lubrication resulting in engine failure.

Old school is the desire for oil pressure.... But what people don't understand is pressure is a indication of flow restrictions. Not good.

Most modern engines are built for high oil flow and less pressure focus. It keeps Parts lubricated and also more even temps, less localized hot spots.

.

 

It gouged the exhaust lobe and scarred it up pretty bad on my motor in the 300k mile range. They replaced it under warranty. The motor was still running well, you could just hear a tapping like an exhaust gasket leaking. When they took the cover off to do the overhead, it was at .025, supposed to be at .010. Then other trucks started having the same problems, but then it started getting into the injectors too and went from 5k cost to 10k+.