Originally Posted by 2006PSDSD
Yes, they are dependable! BUT, they depend on YOU to keep up on their maintenence, and drive/use them hard to keep things clean. Location has a lot to do with turbo vanes rusting IMO, and the EGR delete. DO NOT try and run the Ford gold coolant for more than 100k, because that's when the coolant starts to break down, and leave silica deposits in your oil cooler, eventually plugging it, and in turn popping the EGR cooler, then HG's, in that order
You absolutely don't want to run that coolant at all. Flush the system really well and replace the coolant with ELC from Cat, Rotella, Fleetrite, Zerex. These are silicate free. While what Nick said above may be true the real problem with the silicates is that they can't handle the temps encountered when passing through the egr cooler trying to cool high egt's. The silicates turn into a gell like substance and fall out of suspension. Then they clog the oil cooler. That causes the egr cooler to fail and then the head gaskets.
The good news is YOU can prevent this from happening. Get a set of gauges Like the Edge Insight and monitor your coolant temp and your oil temp. If these get more than 15* apart under normal cruising conditions your oil cooler is becoming clogged. (If you switched to ELC this probably wouldn't be happening to you) Get it fixed immediately. Do not drive it around with the oil cooler clogged. This is what causes the problems. Most of the bad rep of the 6.0 can be attributed to owners not monitoring ECT and EOT and continuing to drive with the oil cooler clogged until something blows. If you watch these temps you can probably get away without blowing your egr cooler or head gaskets.
Be anal about keeping your oil and filters changed and in my opinion use a quality synthetic. This will keep your injectors healthy and happy.
Finally don't drive it like your grandma would. That's the kiss of death to the turbo on these. It has to be exercised to stay healthy. That means seeing full boost on a regular basis.
Now it is still a good idea to delete the egr system if you can and if you can't replace the egr cooler with the upgraded one from Bulletproof Diesel. It is a much sturdier unit.
Do these and yes your truck will be as dependable as any and more than some.