At this point I believe that the BG244 BG 244 Diesel Fuel System Injector Cleaner has cured my issues.I added the BG 244 when my fuel gauge was a bit above 1/2 tank. I figure that to be roughly 13 - 15 gallons of fuel.
After 150 miles of running with the BG 244 it seems like my 2004 is now idling and running a bit smoother. That could be a placebo effect. What is not a placebo effect is that my latest cold weather starts no longer have the initial rough running and smoking. The engine starts normally.
So far it seems that the BG 244 diesel fuel additive has not destroyed my engine and may have actually helped some.
Added: Reading some of the DPF discussions that mentioned high(er) RPM operation reminded me.
After adding the BG 244 to my 2004 I have been doing a bit of higher RPM driving by using lower gears. My thought was to keep the BG 244 conditioned (contaminated?) fuel flow through the injectors at a higher rate. Did it help? Would just driving and giving it the "thrash out" without the BG 244 have produced similar results?
I have no specific data.
The ambient temperature was down to 15F this morning. (We had 60's in February. ) Prior to the BG244 treatment, at that low temperature the 2004 would have stumbled on startup. No stumble today.
Well I suppose I have to confess I am sceptical of "snake oil" fixes!
But in this case the BG line of "fix in a can remedies", seems to work and add up to their claims.
So far as the 244 product is concerned I first used it as an experiement on my Missus' car a 2001 VW Jetta diesel. Now these beast are notorious for plugging up the EGR valve and inlet manifold.
A few 10,000 mile doses of it have kept the inlet tract clear and @ 200,000 Mls recorded of usual urban suburban driving the thing runs very clean and the E test center mentioned it had run very clean when it was last tested.
I was convinced to recommend it which I don't usually do that preferring to take Sailquick's position.
Also once you are done add a can of BG's ATC plus transmission additive. Any abnormal burnishing of the lock up internal clutch will be smoothed out by this stuff.
All the best