Hello,
I have a 1994 international 9400 with a detroit 60 series ddec II engine. It is a 9 speed with 3.74 rear ends.
Since I have owned the truck (4 years) the engine oil temp gauge never worked. I finally replaced it and when I made a trip the reading stayed around 270 degrees. It would slightly go down here and there to maybe 230 and then come back up to 270. The road was rolling hills but over the 2 days it didn't seem to make a difference being on flatter land. I was hauling doubles, a combine with a grain trailer behind it so it is a good load but it was only 60-65 degrees out and partly cloudy. I have pulled the radiator resealed the tanks had it cleaned, new coolant, filter, sensor, and thermostats before this so my temp gauge was at 190 basically all day. oil pressure at 14-1500 rpms was around 52-54 that seems normal to me?
I am wondering since I don't have a baseline in this truck or engine what my temp should be. if this is normal or not. Then if it's not ideas? obviously oil cooler in the front, but what about the one inside? I would be interested in what heavy haulers temp would be at, my load isn't the heaviest but its like a giant sail. I wont be around it for a couple weeks so can't drive it empty to see how it acts then.
Thanks for any help I appreciate it
60 series oil temp average?
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Dpeterson3530, May 22, 2025.
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20* either way of coolant temp. Flat ground easy running, usually 20 under.
Pulling hills it wouldn't be odd to see it over coolant temp.
Did you change temp sender, or sensor?
A 94, the gauge will read off the sending unit in oil pan.
How about a truck pic? Looks like a well equipped dashRideandrepair and Dpeterson3530 Thank this. -
thanksRideandrepair Thanks this. -
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Have you hooked up to the ECM to see what it's seeing for oil temp?
Oil temp that high should get you a ck engine light, if not engine shutdown.hope not dumb twucker, Rideandrepair, blairandgretchen and 1 other person Thank this. -
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Rideandrepair and blairandgretchen Thank this.
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Yeah, I would want to compare ECM vs Gauge.Rideandrepair and Dpeterson3530 Thank this. -
Big Road Skateboard, Rideandrepair and blairandgretchen Thank this.
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Get you a scan guage. - It’ll read out of the J port, and tell you what the ECM is seeing. My guess is your guage is off.
My 12.7 runs 10-20 degrees difference to coolant temp.
It’s a 1995, and the dash gauges are inaccurate.Big Road Skateboard and Rideandrepair Thank this.
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