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  #11  
Old 09-26-2015, 01:10 PM
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Quote:
Originally Posted by Bill K View Post
Are you sure that as your main battery? I just had my wife's X5 d in for the second oil change at 20k miles and the dealer told me there's a secondary battery that gets replaced at the second oil change. I asked her what it was for and she didn't really know. She said it's a smaller battery. I asked if its a regular thing to have to change it out every 20k and as I asked, a mechanic happened to be walking past. She stopped him and asked. He said its only needed to replace it once. I don't know much about it but that's what I was told today.
That all sounds rather suspicious, and the 10k oil change interval is cringe worthy.
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  #12  
Old 09-26-2015, 02:43 PM
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Looking at the receipt, it states
"Replace 12 volt battery as per cbs data" and
"Remove and replace battery and register as per cbs data" and
"Short test to register battery"
The part is 61-21-2-353-812 and it's called EP battery 92ah
That sounds like the main battery. I wonder if there really is a second battery. Maybe there's some type of secret recall?
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  #13  
Old 09-26-2015, 03:14 PM
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I just found this. I'm still not sure what the issues are that necessitate a battery change

http://www.bimmerfest.com/forums/att...4&d=1421772824
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  #14  
Old 09-29-2015, 02:39 AM
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Related to BMW's way to recharging the battery in a fuel efficient ways...in certain type of driving conditions, some cars may not get their battery charged optimally....

Here is the article from Road & Track.

Enginerdy: Why BMW's N63 twin-turbo V8 eats batteries



Quote:
Originally Posted by Bill K View Post
I just found this. I'm still not sure what the issues are that necessitate a battery change

http://www.bimmerfest.com/forums/att...4&d=1421772824
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  #15  
Old 10-01-2015, 01:55 AM
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Quote:
Originally Posted by Joshdub View Post
... and the 10k oil change interval is cringe worthy.
Why is this cringe worthy?
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  #16  
Old 10-01-2015, 09:37 AM
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To sum it up,

Brake Regen Tech
Cafe Standards
Batteries only shallow cycled charged

Add to that, turbos discharge batteries

I suspect this is the primary reason why BMW switched to AGM's (AGM's fare better in discharges)


LOL. I hemmed at hawed after burning up 2 AGM's in our E53 in less than 3 months...
Have ran AGM in most of the rides, if not the 2 garage queens @ home
Went back to flooded
Flooded has higher CCA, higher Reserve for a like2like AGM equivalent.
Can take a burp or 2 in the face with higher voltage whereas AGM's are a touch-e more sensative --- more princessy.

For a daily driver, I do think flooded may be a superior application than AGM.
Marketing aside...

But 2 batteries sound about right under warranty. Every 2 oil changes, it gets a new battery. By the time you hit the 4th oil change, you may or may not have exceeded the mielage under warranty.
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  #17  
Old 03-04-2016, 03:35 AM
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How is it that all the other cars in the world make it 5-8 years before a battery change, but somehow these new v8 bmws need one every two years?

All the other excuses -er 'reasons'- apply to other cars on the market.

Anyone that thinks this is anything other than an epic failure of design and engineering is nuts.
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  #18  
Old 09-18-2016, 12:31 AM
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Quote:
Originally Posted by dkl View Post
Why is this cringe worthy?
It's cringe worthy because BMW dropped the oil change interval from 15k to 10k to try and hide the excessive oil consumption, by hoping owners would get to 10k miles before the low oil warning appeared...
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  #19  
Old 09-19-2016, 12:53 PM
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Quote:
Originally Posted by deepblonde View Post
It's cringe worthy because BMW dropped the oil change interval from 15k to 10k to try and hide the excessive oil consumption, by hoping owners would get to 10k miles before the low oil warning appeared...

Actually its cringe worthy because the original BMW OCI was allowing excessive ENGINE WEAR due to fuel shearing (lowering oil viscosity), creating hidden damage in these motors- BMWs response was to lower the OCI so as to reduce the odds that these motors would fail on their dime.

IMO unrelated to a low oil warning or oil consumption....

(year old thread, but yeah)
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  #20  
Old 09-19-2016, 02:54 PM
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Quote:
Originally Posted by ard View Post
Actually its cringe worthy because the original BMW OCI was allowing excessive ENGINE WEAR due to fuel shearing (lowering oil viscosity), creating hidden damage in these motors- BMWs response was to lower the OCI so as to reduce the odds that these motors would fail on their dime.

IMO unrelated to a low oil warning or oil consumption....

(year old thread, but yeah)
Source?
I just repeated the information from the above linked Road & Track article,
Enginerdy: Why BMW's N63 twin-turbo V8 eats batteries
You may be right though.
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