Quote:
I was recently told that the primary reason that the ULSD fuel is required for most of the '07 vehicals is that their exhaust system is equipped with a "particulate" trap to limit the amount of soot and any other debris they emit.
The LSD fuel has more sulfur than the trap can handle over extended use.
Trap can clog and cause restriction.
The '07 5.9 CTD is one exception to the rule (no trap) so LSD is O.K.
The 6.7 cummins and the 3.0 engine that will be in the Grand Cherokee (early '07) have the trap.
Gary. 
That's true but starting in Jan '07, you'll see the 6.7 in the Rams. These engines have a very elaborite regeneration system in the exhaust system, that runs every 10 hrs of engine operation. When it runs, it cleans the trap out & reburns the soot. It sounds weird when it running in the regen mode but still drives fine.
"It's funny how one project eventually leads (or forces) you into another one.
It's really just one endless project designed to induce insanity and bankruptcy."
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