6.7 Cummins Engine Oil Temperature?

Cummins12V98 wrote:

Vette Racer wrote:
On a 2016 Ram CC dually, 4:10 gear, Aisin, with 1200 miles on the clock pulling 16,500 going into a 30 MPH headwind at 65 MPH at 100+ degrees the water temp would go to 3/4 on the gauge, the oil temp would be 3/8 inch above center and the trans temp would be 1/4 inch above center, then the fan would turn on and everything would go back down close to center and start the climb again. Also the trans would not hold 6th gear and would hunt 5-6 if using cruise, had to go to foot pedal to control that, then it would hold 6th. That's my findings on our first trip. Hope that helps!

In those conditions you may find locking in 5th will net better mileage.

He will NET better if he would leave the cruise off and drive the truck. Let it creep down a little on the up slopes and creep back up on the down side. This is the problem with the power wars. Everyone wants to run like they are not even pulling something. Our OEM are making these trucks with big rig power but are still using passenger car cruise programming. It's reaction is way too slow to keep up with the weights we are towing. My service truck only weighing 12-13000# will gear down on the interstate running 75 MPH on cruise not towing a thing.

Vette Racer wrote:
On a 2016 Ram CC dually, 4:10 gear, Aisin, with 1200 miles on the clock pulling 16,500 going into a 30 MPH headwind at 65 MPH at 100+ degrees the water temp would go to 3/4 on the gauge, the oil temp would be 3/8 inch above center and the trans temp would be 1/4 inch above center, then the fan would turn on and everything would go back down close to center and start the climb again. Also the trans would not hold 6th gear and would hunt 5-6 if using cruise, had to go to foot pedal to control that, then it would hold 6th. That's my findings on our first trip. Hope that helps!

In those conditions you may find locking in 5th will net better mileage.

Heading into Yellowstone through the Bighorn Mountains last week I saw 225 coolant before the fan kicked on, and my oil was about 230ish. Tranny temp was usually anywhere from 163-175 (Aisin, 3:73s)

On a 2016 Ram CC dually, 4:10 gear, Aisin, with 1200 miles on the clock pulling 16,500 going into a 30 MPH headwind at 65 MPH at 100+ degrees the water temp would go to 3/4 on the gauge, the oil temp would be 3/8 inch above center and the trans temp would be 1/4 inch above center, then the fan would turn on and everything would go back down close to center and start the climb again. Also the trans would not hold 6th gear and would hunt 5-6 if using cruise, had to go to foot pedal to control that, then it would hold 6th. That's my findings on our first trip. Hope that helps!

FishOnOne wrote:

Brisk wrote:
Thanks for the replys. Yesterday climbing the grade heading south into flagstaff at 65mph with a stiff headwind grossing 21-22k with my high profile 5th wheel and 100* ambient temps engine temp hit 220 and oil temp hit 246. I wasn't worried about the engine temp since the fan was roaring and it cooled down quick once the road leveled out. But I had never seen the oil that hot.

You may want to consider running a synthetic oil with those high temps.

Maybe AMZ/OIL

sch911 wrote:

Cummins12V98 wrote:

SolidAxleDurango wrote:

Cummins12V98 wrote:
It's a dummy reading. Just drive it and don't worry.

What do you mean a "dummy reading"?

.

The number you see is a guesstimate. Not from a specific gauge. Water and trans temps are real.

They are NOT a guestimate. There is a filtering algorithm applied which is based on the physics of the system. And yes there are also limits used: rate of change, etc. to keep the worry warts out of the sevice department.

As far as the temperatures mentioned are concerned they sound very normal for a long hot grade. I have seen temps much higher in tests with heavy trailers at Davis Dam grade many, many times.

There you have it direct from engineering....

Bottom line reading you see is not from one specific oil temp sensor. But thanks for detailing what I loosely said.

carringb wrote:
All newer trucks have buffered gauges. Keeps the worry worts out of the service department.

Indeed.

As long as the parameters are in a "normal" range everything is fine. No need to fret over a few degrees one way or the other although many will. The coolant temperature gauge in my F-250 was set up the same way.

Brisk wrote:
Thanks for the replys. Yesterday climbing the grade heading south into flagstaff at 65mph with a stiff headwind grossing 21-22k with my high profile 5th wheel and 100* ambient temps engine temp hit 220 and oil temp hit 246. I wasn't worried about the engine temp since the fan was roaring and it cooled down quick once the road leveled out. But I had never seen the oil that hot.

You may want to consider running a synthetic oil with those high temps.

Cummins12V98 wrote:

SolidAxleDurango wrote:

Cummins12V98 wrote:
It's a dummy reading. Just drive it and don't worry.

What do you mean a "dummy reading"?

.

The number you see is a guesstimate. Not from a specific gauge. Water and trans temps are real.

They are NOT a guestimate. There is a filtering algorithm applied which is based on the physics of the system. And yes there are also limits used: rate of change, etc. to keep the worry warts out of the sevice department.

As far as the temperatures mentioned are concerned they sound very normal for a long hot grade. I have seen temps much higher in tests with heavy trailers at Davis Dam grade many, many times.

There you have it direct from engineering....

SolidAxleDurango wrote:

Cummins12V98 wrote:
It's a dummy reading. Just drive it and don't worry.

What do you mean a "dummy reading"?

.

The number you see is a guesstimate. Not from a specific gauge. Water and trans temps are real.