The Silent Service
Join Date: Dec 2010
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I don't follow any of Ford's recommended life cycles for Coolant, or the Oil Cooler. Remember that when Ford started using that coolant is was good for 105K.
Use the deltas from your monitor (a delta spread of 15* at 65mph, on a level grade) to determine the life of your oil cooler. Those with EGR deletes and blocks will of course see a longer life cycle on the cooler. I have 66K on my truck when the first EGR cooler blew (which is what spurred me to learn more about these trucks, looking back I could have easily prevented it).
How you replace/rebuild the oil cooler is critical for how long you get out of your next one will last. (My truck was done under warranty - before any modification was done - so I'm on OEM EGR and Oil coolers as well as coolant for the time being.) When this job is done you have three critical desisions to make:
1) Are you going to continue to use Ford Coolant - if not flush with Restore, Restore Plus, and Distilled water, and make the switch to a silicate-free (EC-1 Rated) ELC. This will sigificantly lengthen oil cooler life, by not having silicates gel up and clog the cooler (International uses a silicate-free coolant and has a lot less issues). This flush should be done prior to the oil cooler rebuild to avoid flushing contaminants into the new body.
2) Solution of the EGR cooler. Upgrade, block or delete, purely based on the owners plans. I'll be going with the BPD upgraded cooler.
3) Remain with the OEM liquid to liquid cooler, or make the investment to the aftermarket air-to-liquid cooler. Where the external oil cooler removes the issue entirely, it is not always the best solution if you use the truck to tow heavy.