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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-22-2009, 04:19 PM
HennyBeamer528 HennyBeamer528 is offline
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Mein Auto: BMW 528i
How to Get more MPG on my E39???

I was wondering if you guys know why my dash says I get 14.2 MPG on my 98 E39. My check engine light is on due to O2 sensor I have to replace but it seems that I dont get much MPG as a should. I haven;t done much work (just oil change) since I got the car in January but the previous owner replaced the whole cooling system and I just had a BMW tech look over my car and its in pretty good shape. Any suggestions?

P.S

I was told by the tech that the vanos seals have to be replaced and O2 sensor but nothing else under the hood.
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  #2  
Old 03-22-2009, 04:23 PM
GSXRYDER GSXRYDER is offline
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O2

With that mileage I would head straight for the O2 sensors.
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  #3  
Old 03-22-2009, 04:38 PM
Waveho Waveho is offline
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Bad VANOS seals and O2 sensors can significantly affect your mileage, so you answered your own question. Other than that, don't accelerate too fast from a stop, check your air filter, and, as our president says, properly inflate your tires.

Oh yeah, and keep ignoring your bad O2s and you'll have to start searching for new cat. converters....
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  #4  
Old 03-22-2009, 05:27 PM
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ashton540 ashton540 is offline
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Yeah man get those o2 replaced. Those can directly impact your gas milage. You're definitely having an issue somewhere. I avg about 17 with about 75% of my driving done around the city and 25% interstate. And even on my most spirited week of driving when I cant keep the car from high RPM I'll still avg around 15.5. Take out the o2 sensor issues and report back.
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Old 03-22-2009, 06:01 PM
silver540it silver540it is offline
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If I really drive like I want I get about 17 + a little. However, if I drive more reserved I can get close to 20 and even up to 21 on the highway (cruising at 70 or less). I don't know about the O2 sensor. I did notice that after my last oil change my mileage improved according to the computer, I have not checked it by the math method yet.
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  #6  
Old 03-22-2009, 06:01 PM
silver540it silver540it is offline
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One other thought, I always use the highest grade fuel I can purchase.
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  #7  
Old 03-22-2009, 06:03 PM
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ashton540 ashton540 is offline
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Quote:
Originally Posted by silver540it View Post
one other thought, i always use the highest grade fuel i can purchase.
+1
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  #8  
Old 03-22-2009, 06:32 PM
silver540it silver540it is offline
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Ashton540, I keep seeing people post (+1) does this mean the you agree with me?
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  #9  
Old 03-23-2009, 05:16 AM
poolman poolman is offline
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Check the car out for vacuum leaks--that one thing will steal mileage quicker than anything else.
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