Originally Posted by vase330
Add to that the cost of refilling Urea every 15K miles service I think it is. Regardless, you have to fill when you go in for some service. You can add a piggy back like procede to your 335i, get diesel like torque, and tone more horse power, and keep the high revving character for a whole bunch more fun to drive. That is if you are so inclined to tamper with the stock car ofcourse, and not entirely necessary.
a bottle of that urea is 10-15 bucks and is covered under maintenance for free.
tuners over in europe have modified the engine in the 335d to make a hell of a lot more torque than a 335i could make on stock turbos