Interesting cooling idea
I put the mishimoto on almost a year ago after kneeling on the stock degass vent and cracking it. That pretty much started a chain reaction that lead to why not put in the bigger water pump. Did that and looked around and thought well hell I got it this far apart let’s get rid of that EGR oil cooler thing a majigy and put in a bullet proof oil cooler. The top of the engine was looking clean so I then decided, dang let’s put in an Airdog pump with a driven diesel fuel bowl delete. I let the fever get me and just dove head first into replacing the turbo with a KC jet fire stage 1 9 blade turbo and a Sinister Diesel 58 VDC FICM. I should have just JB welded the degass nipple onto the stock radiator to begin with.
I'm in the market for a new radiator for another of my trucks (a dodge in this particular case) and Mishi was near the top of the list (only reason it wasn't at the top is price, because Mishi is expensive). Is there an issue with Mishi rads I'm not aware of?
...
Mishimoto didn't have the best start (lots of early discussions). Their advertising was reflecting their product as being superior because of their engineering process. Nothing superior was really realized in any of the products they "touted". Then, they did nothing to set themselves apart in the process of resolving the early issues people encountered.
Nothing has indicated that significant improvements were ever made over time - in their products or customer service.
https://www.powerstroke.org/threads/....712857/page-1
https://www.ford-trucks.com/forums/1...-radiator.html
https://www.powerstroke.org/threads/...rison.1096074/
https://www.powerstroke.org/threads/...grade.1230458/
Edit - admittedly I have not had any desire in recent years to invest time trying to see if they have changed any! I have chosen to use other companies (like BPD who uses Radicon, same as Performance Radiator), and am happy with that approach (150k miles on my BPD radiator and it has performed well).
Nothing has indicated that significant improvements were ever made over time - in their products or customer service.
https://www.powerstroke.org/threads/....712857/page-1
https://www.ford-trucks.com/forums/1...-radiator.html
https://www.powerstroke.org/threads/...rison.1096074/
https://www.powerstroke.org/threads/...grade.1230458/
Edit - admittedly I have not had any desire in recent years to invest time trying to see if they have changed any! I have chosen to use other companies (like BPD who uses Radicon, same as Performance Radiator), and am happy with that approach (150k miles on my BPD radiator and it has performed well).
Last edited by bismic; Dec 29, 2025 at 09:21 PM.
In the 6.4 trucks Mishimoto does have a Version-1 and a Version-2 design, with the difference being solid aluminum vs. rubber posts at the upper mounting location.
The 6.4 trucks had an issue (among their many , many other issues) where the radiator support flexed. This is what caused the stock plastic end tank rads to separate their end tanks from the core and leak. The V1 mishi had welded aluminum posts at the upper mount, so when the rad supported flexed, it cracked the new radiator. Mishi did revise their design, make those posts rubber on the V2 to allow flex, and even came out with a new (and expensive in tradition Mishi fashion) upper rad support brace to help reduce the core support flexing (see link below)
https://www.mishimoto.com/ford-6-4l-...mlnlqbTVNzoQ2y
So at least for the struggling 6.4 community, they did do a lot of R&D, a product revision, and created a part that help to fix the actual root cause of the frequent radiator failures (the core support flex Ford's design allowed) in that particular cursed generation of trucks. That's not to say the rest of the rads are good (because IDK if they are or not), but one of the links above was about 6.4 trucks, and at least for those, Mishi did the most (by far) to help fix the rad issues inherit to 08-10 Ford superdutys
...
The 6.4 trucks had an issue (among their many , many other issues) where the radiator support flexed. This is what caused the stock plastic end tank rads to separate their end tanks from the core and leak. The V1 mishi had welded aluminum posts at the upper mount, so when the rad supported flexed, it cracked the new radiator. Mishi did revise their design, make those posts rubber on the V2 to allow flex, and even came out with a new (and expensive in tradition Mishi fashion) upper rad support brace to help reduce the core support flexing (see link below)
https://www.mishimoto.com/ford-6-4l-...mlnlqbTVNzoQ2y
So at least for the struggling 6.4 community, they did do a lot of R&D, a product revision, and created a part that help to fix the actual root cause of the frequent radiator failures (the core support flex Ford's design allowed) in that particular cursed generation of trucks. That's not to say the rest of the rads are good (because IDK if they are or not), but one of the links above was about 6.4 trucks, and at least for those, Mishi did the most (by far) to help fix the rad issues inherit to 08-10 Ford superdutys
...
Searches reveal more examples, I have no need to put more effort in. People can do business with them or not, no issue w/ me. I have a lot of network connections w/ shops and shop owners (in the 6.0L arena) and I have no intention of giving Mishimoto any endorsements. They burned quite a few 6.0L bridges early. At best, it is good that they learned and developed in the 6.4L world off of their early product failures, but early 6.0L failures and then early 6.4L failures isn't particularly impressive. Maybe the same eventually happened w/ the 6.0L product. That said, learning lessons the hard way is bad enough. Hate to have to re-learn them the same way!
Last edited by bismic; Dec 29, 2025 at 09:20 PM.
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