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post #1 of 5 Old 07-19-2014, 07:28 AM Thread Starter
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oil temp crazy high

First off, my truck has been Spartan tuned for about 60k miles. Knock on wood I haven't had any problems due to the power increase... About 2 years ago I noticed that my oil temperature was not the same as my coolant temperature anymore... Info from Dashdaq unit. Since I put the tuner on the temperatures were rarely more than 2 or 3 degrees difference. All of the sudden its 10 degrees then 20 then 30. I took it to the dealership after returning it to stock condition and they replaced the oil cooler under warranty. After I brought it home I flush the cooling system, put in a new thermostat, and filled it with cat ELC. I also installed a coolant filter. The oil temperature really never settled back down to normal. Oil temp runs about 35 degrees hotter than the coolant temperature. Yesterday I drove the truck on a little road trip to St Louis. Temperature going 80 miles an hour was about 260 degrees. My coolant temperature was under 200.

Could something have immediately clogged my new oil cooler. Could there be a clogged somewhere else in the system? 260 degrees on the Interstate without towing is outrageous.

I wrote this with speech recognition while driving. Sorry if it doesn't make sense in places!
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post #2 of 5 Old 07-19-2014, 07:36 AM
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Yes something did immediatley clog the cooler....it was the coolant flush. You should do that before you replace the cooler because it IS going to loosen up trash and everything loosended in front of the cooler will stick in the cooler. Essentially, not to be mean, but you wasted a cooler doing the flush afterwards. Time for another one and put in a coolant fiter while your at it.

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post #3 of 5 Old 07-20-2014, 08:44 PM Thread Starter
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Makes sense. I think I had the cooler replaced first because I didn't want to deal with the dealership insisting they put different coolant in it than the ELC that I wanted in it.

FWIW, I installed a coolant filter after I had the oil cooler installed. Also FWIW, I don't understand how it could possibly work because it doesn't actually filter "everything" "all of the time". it just takes leftover from the heater core supply (or discharge, can't remember) and goes through the filter. I know I'm not explaining it how my brain is thinking it...

So. Can an oil cooler be replaced without taking the cab off? I know its a big job... But its summer and I can ride my harley while I work on the truck.
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post #4 of 5 Old 07-21-2014, 07:36 AM
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Ive watched my coolant, i have constant flow through my degas bottle so I imagine that it works on the premise of that.

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post #5 of 5 Old 07-21-2014, 08:29 AM
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Quote:
Originally Posted by sjl2725 View Post
Makes sense. I think I had the cooler replaced first because I didn't want to deal with the dealership insisting they put different coolant in it than the ELC that I wanted in it.

FWIW, I installed a coolant filter after I had the oil cooler installed. Also FWIW, I don't understand how it could possibly work because it doesn't actually filter "everything" "all of the time". it just takes leftover from the heater core supply (or discharge, can't remember) and goes through the filter. I know I'm not explaining it how my brain is thinking it...

So. Can an oil cooler be replaced without taking the cab off? I know its a big job... But its summer and I can ride my harley while I work on the truck.
That's correct that it doesn't filter all of the coolant on a pass. It's just a bypass filter so it would take a few circulation to actually filter all the coolant. With a filter right in the circulating system you would really have to be careful because if it ever did plug, the system would be dead ended. I'm assuming this is why we use a bypass style of tie in.

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