6.4L problems caused by Stop-Leak additives. - Ford Powerstroke Diesel Forum
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Old 06-24-2013, 08:15 PM

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6.4L problems caused by Stop-Leak additives.

The purpose of this thread is to gather information to use against a local dealership who tried to fix a radiator leak, that they likely caused, by adding 2 bottles of stop leak additive to the coolant of my 2008 6.4L F350. I would appreciate any replies or PM's if you personally know of any cases where stop-leak additives caused blockages or damage to a 6.4L diesel truck. It can be your truck or the truck of someone you know, and it would especially be helpful if you're a mechanic or technician that could provide any actual worst case examples. I know Ford has given technicians notices in bold print that says "NOTICE: Use of commercially available stop leak products in the 6.4L Diesel may result in engine damage.", and I have a copy of one of these warnings from Fords technician database, but now I need some actual examples damage that has resulted from stop leak additives being added to the 6.4L engine coolant.

As a personal example, I worked as a salesman at a Ford dealership for a while after I got out of the service. One afternoon I had a long talk with a service customer who was pacing around our internet cafe. Apparently he had been through 3 or 4 radiators on his truck, and when the next one started to leak during a road trip he tried to quick fix it with some stop leak additive . The service dept told him that the stop leak had plugged up his oil cooler and and some other things, but I don't recall his exact description of the troubleshooting and diagnosis. I do remember that he paid lots of money to replace the radiator, oil cooler, thermostats, water pump, and I believe he also had the heads removed and cleaned because they also found an issue with the head gaskets.

Again, if you have any examples like this to share please reply in this thread or PM me. If you would like to include names and locations that's fine, but it's certainly not required.

Also, if you would like more detail about my dispute with the dealership details are in this thread: Trip to dealership with 6.4L ends badly with unauthorized repair



Last edited by Mr Hahn; 06-26-2013 at 08:46 PM.
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