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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old Today, 11:37 AM
jonesdds jonesdds is offline
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Location: Santa Barbara
 
Join Date: Apr 2003
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Mein Auto: 330i Conv
Urea fill up intervals

I'm not finding this in the manual just it should be maintained when in for oil changes. How many miles are expected from one tank? Can it be refilled if not near empty? I do some 800 mile trips with no dealers in between, would hate to limp home halfway there.
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  #2  
Old Today, 12:43 PM
montr montr is offline
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Location: Atlanta
 
Join Date: Oct 2006
Posts: 331
Mein Auto: 335d 2010
When you are low fluid, you will get a warning with 900 miles left. I refill then with 2.5 gals. Do not overfill.
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  #3  
Old Today, 12:45 PM
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Flyingman Flyingman is offline
hang up and drive!
Location: Miami
 
Join Date: Sep 2009
Posts: 2,612
Mein Auto: 335d
Quote:
Originally Posted by jonesdds View Post
I'm not finding this in the manual just it should be maintained when in for oil changes. How many miles are expected from one tank? Can it be refilled if not near empty? I do some 800 mile trips with no dealers in between, would hate to limp home halfway there.
Welcome Newbie!

The DEF should last the OCI which is 13k miles under normal driving conditions. If you jackrabbit start and stop, it could be less. If the dealer fails to properly fill both (Active and Passive) tanks it could be less.

I usually get the warning light very close to 13k miles and it gives you 999 miles warning. If you go past the 999 miles then your car will not stop, but it wont restart if you do shut it off.

I've actually never added DEF to my 335D as it has always been done by the dealer at the scheduled services. Once they improperly filled it, of forgot to fill it, but they corrected it after I returned and complained.

I think our DEF tanks hold about 6.5 gallons total. You should burn about 1-2% DEF for every gallon of diesel fuel, so you can do the math on your mpg and driving 13k miles.

There is plenty of threads on this site that discuss all about this topic.
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  #4  
Old Today, 12:57 PM
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Doug Huffman Doug Huffman is offline
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Location: Washington Island, Wisconsin, thru Death's Door
 
Join Date: Apr 2015
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Mein Auto: 2012 Feb 11 X5 35d (E70)
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Originally Posted by Flyingman View Post
You should burn about 1-2% DEF for every gallon of diesel fuel, so you can do the math
so, one should burn 50 - 100 gallons of diesel fuel for each gallon of DEF injected.
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  #5  
Old Today, 01:06 PM
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Flyingman Flyingman is offline
hang up and drive!
Location: Miami
 
Join Date: Sep 2009
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Mein Auto: 335d
Quote:
Originally Posted by Doug Huffman View Post
so, one should burn 50 - 100 gallons of diesel fuel for each gallon of DEF injected.
You did the math Doug!

13,000 miles divided by 29mpg = 448,3 gallons of diesel X 1% = 4.48 gals of DEF.

The 1-2% is a guideline, I think it is closer to about 1.5% in actuality.

Supposedly it measures the exhaust emissions and meter the DEF (Urea) accordingly.

I just don't worry about it, let the dealer top it off each OCI and forget about it.

In my MB GL350 I just top it off every 5-6k miles because the dealer will charge a ridiculous price to refill it.

The business of draining and refilling the DEF tank I don't think is required. At one time it was but I think actual results have shown it is not necessary.
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2000 Silver Z3 3.0i (Ret)
1999 Silver R1200C (Ret)
1968 Black 1600 Coupe (Ret)
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