From cars.com
http://blogs.cars.com/kickingtires/2009/07/bmw-puts-4500-behind-diesel-models.html
BMW Puts $4,500 Behind Diesel Models
"It's not likely that many folks would shop at a BMW dealership looking to cash in on the Cash for Clunkers program, which is why the company has launched a new incentive to promote its two fuel-efficient diesel models. A $4,500 "eco-credit" will go toward the purchase of either a new BMW 335d or an X5 xDrive35d, on top of current financing offers, and with no trade-in required.
A 335d starts at $43,900, so according to the government program's rules, it could qualify for either $3,500 or $4,500 in federal funds when exchanged for a clunker, no matter how many options it was loaded up with. The 335d is also eligible for a $900 tax credit. The 335d gets combined mileage of 27 mpg, versus a gas 335i's 20 mpg, while still delivering a thrilling driving experience. We found a few modestly equipped 335d models in Cars.com's inventory for $45,225. Add all the above incentives, and those would end up costing $35,325. Read our full review of the 335d here.
The X5 starts at $51,200 and thus would not be eligible for the government incentive (program rules say any vehicle with an MSRP over $45,000 can't be bought using Cash for Clunkers), but with BMW's eco-credit it would cost less than a base X5 xDrive30i. The diesel incentive offer runs through August."