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Diesel power just in: Mercedes GL320, BMW X5 3.0 diesel, BMW 335d
Some automakers have had long-standing plans to offer diesel engines in this country. European automakers have stuck with those strategies despite the volatile price disparity between diesel and regular fuel. Japanese and domestic automakers, including Honda, Nissan and GM, have shelved their diesel plans for now. Impressed by diesels we’ve previously tested from Mercedes-Benz and Volkswagen, we have added three more to our test fleet to see how they compare to their conventional counterparts. Our latest diesel models include the Mercedes-Benz GL320 Blue Tec and a pair of BMWs–the X5 and the 335d. Mercedes-Benz GL320 Blue Tec We were impressed with the GL450 when we tested it in 2006–a roomy, comfortable, yet responsive handling vehicle. We were also impressed with the 210-hp, 3.0-liter V6 diesel engine when we tested it in the E320 Blue Tec, which combined strong performance and refinement, yet returned 29 mpg overall. It was also free of traditional diesel smell, smoke, and sluggishness. Hence, we wanted to see how this engine performed in the GL. Even though the GL is very heavy (5,655 lbs.), this engine remains smooth and muted, but initial off-the-line acceleration is sluggish. Once underway, it pulls strongly and manages to hit 60 mph in less than 10 seconds–a far cry from the 7.4 seconds we recorded for the GL450. Observed fuel economy, so far, is averaging 20 mpg overall. We got 15 mpg for our V8-powered GL450. If you’re starting to crunch the numbers, you should know that the GL320 is actually $1,000 cheaper than the GL450. The other major difference between the two is that the GL320 comes with 20-inch run-flat tires, which brings more impact-harshness to the ride quality. Plus, the steering feedback is compromised. The GL benefits from a $1,550 federal tax credit for the first 60,000 purchasers, but you won’t qualify if you hit the AMT tax. BMW X5 3.0 diesel In contrast to the Mercedes example above, the X5 diesel adds an eye-opening $3,700 to the price of the 265-hp, regular-gas 3.0 model. So far, our diesel X5 is getting 23 mpg on average, compared with 17 mpg overall for the gas version. The X5’s diesel is not quite as refined as the Mercedes but feels punchier. In fact, it beats the regular X5 in 0-60 mph acceleration,...