Originally Posted by zhilton

OEM...either Navistar or Motorcraft/Ford package is the ONLY thing I would use on this motor. If you want to see something scary, search Dorman in this forum...it'll give you nightmares. When I did mine two years ago (high delta) I bought a bunch of parts from Clay...including this Ford oil cooler kit:

Oil Cooler Kit - Riffraff Diesel Performance

You might find a better deal somewhere else, but I can assure you his customer service is second to none. I can only remember once having an issue with an order from Clay and he was quick to resolve the issue in a manor that we both were happy. If I were you...and assuming your oil cooler is clogged...

(A) flush your engine and get rid of that Ford gold coolant. You'll need either Ford VC9 or Prestone Restore flush to get everything clean. Do this before you pull anything from the engine; don't want to pump that stuff through your new oil cooler after your done.
(B) while you've got your intake out/exposed; soak it with an aluminum safe cleaner for 10-12 hours then take it to a car wash and wash it out. Mine as well do while you've got it out of the truck, especially if your going to delete the EGR cooler.
(C) after you get everything back together; go with an extended life coolant like Caterpillar ELC or Napa Zerex. I subscribe to the theory that Ford gold coolant is the root of the problems with the oil cooler & EGR cooler. I went with Cat ELC 238-8647 (concentrate); the 50/50 premixed is 238-8648. I figure if works great in a 1000hp bulldozer; it'll work well in my 325hp trailer queen.
(D) get yourself a coolant filter. While you don't have to do this, it will catch all the crap that can/will clog your oil cooler. Generally the oil coolers don't fail...they just fill up with crap. Which lead to their failure to function.
(E) clean/inspect your turbo's vanes & unison ring. You'll need to pull the turbo to get to the EGR cooler. As well as inspect/replace your CAC boots; especially the hot side.

If you need links or instructions...I can look them up for you. I think a good Ford tech and pull an oil cooler/EGR cooler and clean the turbo....and have it all back in and running in something like five hours. My truck took me a weekend...but I'm not fast and I don't work on 6.0L for a living.

Originally Posted by zhilton

Not the plugs, but the o-rings that are on them fail. Sort of like the STC fitting...the original design usually goes around 65k to 85k miles. The revised design appears to be rather roboust. I was trying to find a diagram of where they are in relation to the high pressure oil rails (that feed the injectors) but the link I have is dead. How many miles (roughly) do you have on the truck? If your over 100k, I feel confident that they've already been replaced. But an Oasis should confirm that theory.

Originally Posted by happscrap

Truck has almost 99k miles. STC ... I'll look that up. So I should replace it. What brand? Oem ford? You stated they make a more robust one.. If so.. I will order that asap.
As to the dummy plugs... your saying it's an o-ring on each injector? So I'd have to pull the rails and each injector?

Originally Posted by r2millers

Here's a good thread to help explain both.

Enjoy.

https://www.ford-trucks.com/forums/1...s-and-stc.html

Originally Posted by happscrap

Napa Zerex? Do you mean the g5 zerex? Or another type of zerex.

Originally Posted by happscrap

Truck has almost 99k miles. STC ... I'll look that up. So I should replace it. What brand? Oem ford? You stated they make a more robust one.. If so.. I will order that asap.
As to the dummy plugs... your saying it's an o-ring on each injector? So I'd have to pull the rails and each injector?

Originally Posted by zhilton

Yes, while I don't run it...I've heard of others running it trying to get away from Ford Gold. Might not hurt to figure out what Navistar runs in their 365VGT (their name for the 6.0L) powered trucks. Other than the horsepower, it's the same exact engine...including the EGR system. Just make sure what you use is designed for a diesel engine. Green coolant from the dollar general store isn't your best bet in this case.If...and I stress the IF, you need to replace the STC fitting; use a Ford/Motorcraft packages part. It can't be stressed enough on this engine...aftermarket doesn't work out. The oil filters are a well published case in point; but there have been allot of problems with aftermarket parts failing sooner than the OEM parts. Ford only sells the updated version of the STC fitting. While this doesn't point out directly where the dummy plugs are, they are in the "W" pipes that feed the high pressure oil to the tops of the injectors. The second image down is what your motor will look like:

https://www.ford-trucks.com/forums/1...l#post11720607

The STC would be the only thing I'd worry about with the turbo out. If/when you need to deal with the dummy plugs...you don't have to pull the turbo to get to them. They're under the valve covers and not near as involved to get to.