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2000 mack vision high oil temp


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vision with E7 460.140k on it,water temp running about 180 to 200 deg but oil temp running around 220 and on long pulls it will go to 235.When oil gets up in temp engine brake cuts out below 1500rpm works fine when oil temp is same as water.truck is serviced on regular intervals and is in showroom condition in and out.owner operator.Wondering if there was a fix for this condition.

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an old thermostat might be loosing efficiency. my truck was holding coolant temp ok so i thought and oil temp was running higher and i couldn't work out why. When i replaced the thermostat it was obvious the fan had been working harder then it had to to keep temps at bay. My coolant temp now pulls back quickly, fan works half the amount of time and oil temp is back to normal. Over time you don't notice your cooling system working harder and harder. May not be your problem but for the sake of a thermostat its worth a try. Cheers

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