2016 cummins isx15 high oil temp

1. Reasons for high oil temperature, System Issues: The engine oil temperature is regulated, in part, by the cooling system. If there are problems with the coolant system, such as a malfunctioning radiator, water pump, or thermostat, it can result in inefficient cooling. Inadequate cooling can lead to higher engine oil temperatures.
2. Insufficient Lubrication: If the engine oil level is low or if there is a problem with oil circulation, such as a malfunctioning oil pump or clogged oil passages, it can lead to inadequate lubrication. Insufficient lubrication causes increased friction and heat generation, resulting in elevated oil temperatures.
3. Engine Overheating: Engine overheating, often due to issues with the cooling system or components like a malfunctioning radiator fan or a blocked airflow, can directly affect the oil temperature. When the engine overheats, the excess heat transfers to the oil, causing an increase in oil temperature.
4. Oil Viscosity: Using engine oil with a viscosity grade that is not suitable for the operating conditions or outside the recommended range can result in higher oil temperatures. Oil that is too thin or too thick for the engine's requirements may struggle to dissipate heat efficiently, leading to elevated oil temperatures.

 

The older isx used a thermostat for the oil cooler. Not so sure about the newer ones, but the reliefs might be something to check out.
Also, what is the actual oil temp? You can only trust a gauge to within 10%.

 

Check that Sensor compared to real temps from a probe gun. Bet you have a biased sensor giving you issues.

 

Also if servicing the oil cooler, pull the thermostat OR have it tested. Me I like a problem free system and less parts to rely on.

 

The only thing the oil bypass valve does is opens to pass oil by the oil filter if it becomes clogged. So should have no effect on high oil temp.

 

sounds normal i just sold one of the boat anchors run the same temps as you say