Owners of the new crop of clean diesels will have another maintenance item to concern themselves with if their new cars are equipped with urea injection. The EPA requires that all diesels meet strict new emissions standards, which almost always requires the use of either a NOx trap or urea injection. To ensure that the system is working, a sensor checks both the level and the quality of the urea solution and will keep the car from starting if the tank is empty. The new VW Jetta TDI doesn't use urea, but the new Mercedes-Benz BlueTEC vehicles do. According to Mercedes, a counter will appear on the dash when there are twenty starts remaining. If the driver ignores the message, the car will not operate until at least two gallons of urea solution is added to the tamper-proof tank that resides in the spare tire well. Engineers have designed the urea tanks to be large enough to last about 15,000 miles. This should be large enough that drivers never run out, as the tanks will be checked at every schedules service. As an alternative, small bottles of the urea solution will be available for owners who want to maintain the system themselves. The cost of the urea solution, which MB refers to as AdBlue, will mirror the cost of diesel fuel, so a refill shouldn't cost more than $30 or so. Before anybody asks, yes - urea is a component of urine, and no - peeing in the tank will not fool the sensors. You've been warned.
We recently received a note from an anonymous source indicating that there's a mildly strained relationship between VW and some of its dealers. The source of the consternation seems to be the highly anticipated Jetta TDI, which was just recently released in the U.S. market. Apparently, Volkswagen of America has gotten complaints that some dealers are adding a significant markup on the new and desirable model -- a big problem for many automakers when a new model makes its initial introduction. The dealers are eager to make some money on the new cars while VW is concerned that customers may just look elsewhere because they feel they're being treated unfairly. What's more, some VW dealers may not be all that excited by the new model as there aren't that many available quite yet. This is a situation that's frustrating for the dealers, VW and, most importantly, prospective customers. Volkswagen promises that the situation will improve, and we hope it does. If the clean diesel engine is truly capable of returning the kind of fuel mileage that VW says it can, the Jetta TDI sedan and Sportwagen may indeed offer an ideal alternative to gasoline-sipping hybrids, that is, if customers can put up with the buying process.
Sales of Nissan's first clean diesel in America could be severely hampered before the car even gets a chance at life. According to Nissan, the diesel engine slated to power the Maxima could come equipped with a manual transmission as its only option. We honestly can't imagine Nissan going through with this idea. Diesels already have a mildly bad reputation in the states due to some of the not-so-great oil-burning products our market has been cursed with in the past, and Americans have a profound penchant for choosing an automatic transmission over a manual. Therefore, endowing the Maxima diesel with a stick as the only option seems like a death knell in terms of sale, although it's probably the gearbox that we'd choose as enthusiasts. Considering how well Nissan has done with its CVT transmission, we wonder if the company could find a way to pair it with the Renault-derived diesel slated for the Maxima.
For what it's worth, the Japanese market has not been properly introduced to the diesel engine, either. Nissan's first product with a new clean diesel for its home turf will be the X-Trail SUV. The assorted powers-that-be at the company have already decided that a manual tranny shall be the only option on that model due to the M9R engine's inherent turbo-lag.
Toyota has earned its reputation for producing fuel efficient vehicles, but one dent in the Japanese automaker's armor has been the gas-guzzling Tundra and Sequoia. To help rectify the situation, Toyota Engineers have been working hard on a 4.5L clean-diesel powerplant that will substantially improve fuel economy for the body-on-frame trucks. The 4.5L engine is reportedly scheduled to arrive Stateside by 2010, and it's a no-brainer in light of the fact that both Ford and GM are offering similarly sized oil-burners for their trucks and SUVs.
You may remember the Dually Tundra fantasy truck that was shown last year at SEMA. Well, this news means the mega-sized diesel may not be far from reality. Inside Line is also reporting that Toyota may be delivering a monstrous 7.0L diesel for a commercial-grade Tundra, with a possible production date around 2011-2012. Toyota still hasn't given the go-ahead for a heavy duty Tundra, so the king-sized diesel powerplant likely will arrive only if the larger Tundra does, too.
We've been hearing about Honda's upcoming clean diesel for quite some time now, and the automaker was kind enough to show a cutaway of the i-DTEC clean diesel for us at the 2008 Detroit Auto Show. Expect to see the engine appear first in an upcoming and unnamed Acura product around 2009 - but while you may have to wait over a year for the engine, you can see some cutaways of it right now in our photo gallery below. Click past the jump for some brief commentary on what we learned about Honda's i-DTEC clean diesel in Detroit.
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