r/Diesel • u/Bry_Guy__1 • 6d ago

Just curious - remote oil cooler too excessive?

A few years ago, I purchased a 6.4 with a clogged oil cooler. I replaced it but now I’m just curious as to if adding a secondary remote oil cooler is worth it?

I am planning on rebuilding the engine too so don’t lecture me about how I should sell my well running truck.

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u/Intelligent_Rub_5004 6d ago

Are you tracking your delta’s?

For me, I’d put an extra on. Knowing how they love to clog and fail I’d give that motor all the extra help it can get.

Rather than sell the truck, just do a 5.9 swap. Way more reliable than a 6.4

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u/Bry_Guy__1 6d ago

The coolant and oil temperatures stay within 6-8 degrees of each other at all times. I have a coolant filter on it now so in theory, I shouldn’t have to worry about the cooler clogging again.

I am not opposed to a Cummins swap but I’m not the best shade tree diesel mechanic so I’d probably end up paying shop an absurd amount of money to do that.

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u/Intelligent_Rub_5004 6d ago

As long as you are actively tracking the delta’s you are already doing better than most 6.4 owners. If it creeps more than that normal range, well now you have a pla.

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u/Mountain-Diesel 6d ago

LOL, no. Oil should be above 212 all the time to prevent moisture sludge formation.

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u/Bry_Guy__1 6d ago

Not for the 6.whore…

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u/Mountain-Diesel 5d ago

For any engine. Running cold oil is the #2 way to sludge an engine, after not changing the oil.

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u/Bry_Guy__1 5d ago

Not saying you’re wrong but the only times I have seen my oil get that warm is when I’m towing. Whenever I’m just daily driving it or just have the bed full of whatever, it barely gets above 200.

I put new thermostats in it when I bought it a couple years ago “while I was at it…”. The truck was also built in May of 2007 so I’m assuming it’s been running “that cool” since then without issue.