Quote:
Originally Posted by bcredliner
I don't understand how you can conclude the trans cooling is inadequate when something else is amiss. Might save some time and expense to have transmission diagnosed at a trans shop.
I have over 118,000 Texas miles on a heavily modified 4.6. Trans has Dinan software and I change the fluid and filter about every 40,000 miles with ZF fluid. Never a problem with cooling or anything else. That is anecdotal but poor OE trans cooling hasn't been a common thread here to best of my memory. Just FYI.
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It may not be, but I think the atf is allowed to run too hot. 200F with no towing shouldn't be seen.
ATF doesn't hold up to heat like engine oil does.
Maybe the cooler is adequate, maybe a cooler thermostat is the solution. Either way, the short life of the rubber seals and the solenoids failing. Which both lead to other issues. Do you really think that just happens because of how they're made? No, the transmission runs way too hot and essentially slowly cooks all the rubber and plastic parts which causes other issues.
Think about that. Take the average diesel HD pickup. They run 170-180F ATF driving around and only go up a tad more when towing.
With 180F ATF, can you imagine what the temp is inside the torque converter.
I'm no expert, but I truly believe most of the issues with these X5s would be avoided by running cooler. That's engine and atf thermostats.
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