In 2007 the requirements for diesel engines int he US will change drastically. Many automakers are waiting to introduce new diesels in the US until those requirements are set. they are also exploring many ways to get these diesel engines to meet those stringent requirements. By 2007 the diesel engines will essentially be cleaner then gas engines, while still getting the excellent gas milage and that good old diesel kackle you hear from the "old" diesels will be non-existant. Also for those of you diesel guys...that diesel smell will also be 100% gone.
my Dad drives a new diesel Volvo imported from Eurpoe with the new emmissions technology and the new type of engine in it. The exhaust smells like steam coming off a pot of boiling water...no exhaust smell whatsoever, and it is no louder then the 5 cyl. 2.4 liter gas engine in my dad's old 95 850. When he started it up i figured it was a gas car. He has gotten as high as 45 miles per gallon in this big volvo (It's the large S80 sedan). Also that misconception that diesels are slow is totally wrong..lol. If you put the throttle at 3/4 throttle in this volvo, once the turbo charger kicks in both rear tires squeal. If you give it full throttle...hold on!!
This vehciel was imported as a promotional vehicle for his company, they also imported a Jeep Grand Cherokee diesel (It's been nothing but trouble, but look who manufactures it...

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My Dad brings these 2 cars to various shows and conferences around the US and this volvo amazes people. He let the press drive his car and they were totally impressed. they said they would never know it was a diesel if it wasn;t getting 30 some miles per gallon.
Ford is currently working on a 6.0L next generation powerstroke for the F250/350/Excursion chassis and in the future my Dad has heard there will be a 6 cyl version of the powerstroke in the F150/Expedition chassis and quite possably that same 6 cyl in the explorer/ranger or the 4 cyl engine used in rangers in eurpoe.
Don;t expect ford to offer the smaller diesels until maybe 2006, but from what I hear, my next ford SUV will be a diesel!