NITRO307

Have been trying to figure out how to attach images here... You can do your own search but PWR ones fail for the same reasons as the ford ones. They can corrode due to electrolysis or corrosion. PWR states, "At time of installation an approved coolant must be added to the cooling system. Two simple rules have to be followed - never mix coolants and always use distilled water." and "Select a coolant that is recommended by the manufacturer or by PWR. The coolant must meet the current AS2108 or manufacturers engine coolant/inhibitor standard. Bring engine up to temperature and let cool. Recheck the coolant level and top up if necessary. Use only distilled water." You will be surprised to hear how many mechanics and car owners use tap water to prepare coolant mixture. Tap water can cause pitting corrosion in aluminium. Below are few examples of PWR failures.

If external cooler fails, you lose trans fluid without knowing and damage the gearbox permanently. Moreover there are many issues of installing external cooler and many people have complained of issues after installing one. Some people have had no issues in their specific situation other than clutch slipping when cold. External coolers can cause abnormal gear shifts, premature wear or worse a damaged gearbox. There are millions of ZF gearboxes running well with coolant to trans fluid heat exchangers on Ford, BMW, Audi, Land Rover and many more ZF R&D team decided on it that way after extensive testing including sub zero temperatures as well as desert conditions. I know which one I'd prefer. But people shouldn't get sucked into unnecessary mods promoted by mechanics.

Not ignoring the fact mate. OEM heat exchangers fail due to various reasons. PWR ones fail too. Outer shiny case on PWR is just a false sense of quality. Look for yourself what is inside them. (Many other design issues I won't get into). Even PWR state in their documentation that they do not warrant against corrosion of aluminium core inside their product. Your gearbox won't be covered by PWR. At best you can get replacement heat exchanger but have to prove you didn't corrode it by not following the instructions. If you do your research, you can find many PWR's failed. Their lower number of failures are because of very very low number of PWR's sold as compared to OEM heat exchangers.

Don't waste money on PWR sh*t. It has aluminium core inside which can corrode like any other heat exchanger. Save you $$ for other mods and get a genuine OEM replacement for $200.