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Old 01-18-2010, 01:30 PM
Funf Dreisig Funf Dreisig is offline
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Location: USA
Join Date: Mar 2004
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Mein Auto: 77 530i & 09 35d
Originally Posted by Penguin View Post
I am constantly amazed how BMW NA shoots itself in the foot when it comes to customer satisfaction. Why go to the bother of excluding between oil change DEF additions? It should not be a very common occurrence, unless there is something wrong with the system (in which case the warranty would apply anyway). It seems they are damaging their image and customer satisfaction for a very small cost savings. Since they flush and refill the system at the oil change interval, how hard would it be for them to just issue an SIB which tells the service people to check the miles until service, do a simple computation, and just add enough DEF to bring it to the next oil change, if it runs short between changes?
I agree! This issue could blunt the acceptance of the BMW Diesels for some time to come. All it has to do is become "common knowledge" that DEF is a hassle and BMW charges diesel owners high prices for topping it up between oil changes. Undoing that kind of bad PR could, and probably will, cost BMW far more than just taking care of it for the customer.

BTW the calculation you mentioned is simple IF you have some idea of the DEF usage rate ranges for any particular model. IF BMW has this info (and they should), they certainly don't seem to be sharing it with the BMW dealers and techs. Otherwise, BMW techs would know almost immediately that the low mileage between DEF top up issues we've read about on this and other X5 forums indicate:
1 - The DEF system on that 35d is not working properly: leaking, wasting DEF, etc..
2 - Both tanks weren't and/or aren't getting filled properly.
BOTH 1&2.

FWIW I'd bet the DEF usage rate for a 35d is somewhere in the range of 1,800-2,000 miles per gal of DEF. At this rate most 35d owner's would not need to top up the DEF between oil changes (11-13,000mi).

Funf Dreisig

Last edited by Funf Dreisig; 01-18-2010 at 01:34 PM.
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