Okay, this has been developing over the past couple months. It's going to be a long read, but I want to explain what is going on so bear with me.
My truck is a 2008 F-250, Job 1, with 35,000 miles.
Previous problems: new turbo, new radiator, new intercooler all around 24,000 miles.
Here is what is going on. At first, I've noticed a slight increase in "Cleaning Exhaust Filter" frequency. Just blew it off as a change in driving habits or whatever. I didn't change nothing though as far as my actual driving habits other than the fact that here in the past couple months I’ve been driving the truck MORE, which would obviously lead me to believe that it would Clean the exhaust filter more often. However, upon closer look, I've noticed the miles between regens have dropped significantly. Maybe to one regen every 100-125 miles. It regens TWICE a tank now like clockwork and my MPG's have dropped down to roughly 10 (where as before was 12-13). Before it was averaging every 175-200 miles. Okay, cool, nothing too major, so I just noted it and went on about my business.
Okay, that's when I first started noticing little changes in how the truck acts. Now, granted that every single morning/evening here in Eastern KY has been very humid and about 70 degrees. Once the truck gets up to operating temperatures the truck has started a very sluggish acceleration. I blew it off again as just water in the Intercooler (although, I have already replaced the intercooler once before for this problem of white smoke in rainy conditions). Sometimes I will see grayish/blue smoke when this happens, but not every single time. Sometimes it is so sluggish that the truck shakes, hesitates and feels like I’m towing a house behind me. Typically when I see smoke a regen follows shortly thereafter. Tailpipes are clean. Again, I just noted it and went about my business because other than that, the truck drives fine with no lights on the dash.
Just about anytime now that you accelerate from a stop, the truck feels sluggish, although it rev's fine. Again, it feels like it is towing a house behind me. It still makes good boost 35+psi on the stock gauge.
Now, to make this complex back in late Feb/Early March I had the radiator, turbo, and intercooler replaced. I drove it without any problem. During this last oil change I noticed the radiator coolant in the degas tank was about an inch below the cold fill line. And before, it was right at and mostly above the cold fill line two or three months after having the radiator replaced because I watched it like a hawk until I got confident it wasn't loosing coolant. Now..... it's loosing coolant somewhere. I've looked all under the truck and can't find a trace of it, although it has been raining quite a bit here so it would be a little hard to notice if it was leaking at times. During this last oil change, I sent my oil off to Blackstone like I have always done. This is what pushed me over the edge to get concerned.
Truck is 100% BONE STOCK. Motorcraft EVERYTHING since brand new. Last air filter was changed at 21,500 miles, last oil was changed at 34,100 miles, and last fuel filters were replaced 32,100 miles. Oil/Water Separator drained monthly; religiously. Power Service ULSD Fuel Additive/Cetane Booster has also been used since probably December of '09.
What in the world is going on!? DPF getting plugged? EGR system going bad?
The more time that goes on the more aggravated I get at my truck, and i'm starting to lose confidence that something bad could go wrong at any minute. It's been in the shop 3 times in one year. I bought the truck August 25th 2009. I've considered trading it off, but I can't really afford to to be honest. I just bought some 295/65/20 Nitto Trail Grapplers that will be delivered at the end of the week. I do love this truck, but I'm starting to second guess myself if I want to deal with it or get rid of it. Is this something to be worthy enough to take to the dealer for or do I just keep driving until something happens? I have been told that Ford does not recognize oil samples. I am out of my factory warranty (time wise), but I bought the ford ESP Extra Care warranty with the truck.