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[rheiner]

My oil temperature appears to be approx 20 degrees higher this year than the past few years with similar ambient outside temps and conditions. Is rising oil temp a sign of pending engine failure and what causes it to rise?

The engine is a 110 in 2010 SEUC. I'm using the HD oil temp dipstick for readings. I just checked it in boiling water and it's spot on; been using this same dipstick for 4 years with no problems. Have made no modifications to engine or exhaust for several years. I'm getting oil temp of 260 F on a 90-95 degree day after riding on freeway. It used to be 240. The engine otherwise runs great, plenty of power and torque, no oil usage between 2500 mile changes. 61,000 miles on engine, 30,000 on heads.

[HD Street Performance]

Have a look at the fins of the cooler. They pick up crud anf get restricted then need periodic cleaning

[grc]

Yup, and also make sure the cooler bypass valve is actually opening and allowing oil to flow to the cooler.

What else has changed on the bike?  Are you still running the same tune, using the same brand of oil, etc.?

Jerry

[rheiner]

I don't have a cooler by pass valve. I run a 10 row Jagg oil cooler with the motor. I've been using Mobil 1 Twin V motorcycle oil for years, and no new tune the past few years. I pulled the spark plugs and they look good (white to slight tan color on both). I did take the oil filter adapter off and inspected it. It looked fine. I installed new gaskets and put it back on. I blew out the oil cooler with compressed air. I did get some oil emulsion that came out, a yellowish substance floating on top of the oil. The next day it was dispensed. I assume it means that I didn't run the motor long enough the previous time to evaporate the condensation and water in the oil. I always make sure I clean the fins of the cooler whenever I change the oil and did so again when I serviced the oil cooler. The fins weren't dirty. The outside temp has not been warm enough the last few days to compare and contrast the prior 260 F oil temperature so I'll have to wait until it gets back to the 90s.

[HD Street Performance]

The stock CVO oil cooler adapter is equipped with a thermostat Jerry is describing.

[timtoolman]

Maybe Quality of gas causing higher engine temps?


Sent from my iPhone using Tapatalk

[rheiner]

The stock CVO oil cooler adapter is equipped with a thermostat Jerry is describing.

I knew the stock oil filter adapter is equipped with a thermostat but not the Jagg model I put in it. Mine causes the hot oil to first go through the filter then to the cooler. If I'm not mistaken I seem to recall it is opposite from the stock adapter.

[HD Street Performance]

Ok then full flow all the time.