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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 02-04-2015, 05:24 PM
Socalx5er Socalx5er is offline
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Stupid question with picture!

Howdy all,

First-time poster here but have been lurking for a few years. Appreciate the education I've received from this forum.


Now on to the stupid question. Looking under the hood this past weekend, I noticed that the outside of what I think is the alternator has a whitish coating on it. Or in other words, it looks like the metal covering has oxidized or something. Nothing wipes off and nothing around the part has a white coat, so I doubt something was spilled on it.

I am the original owner and to my knowledge, nothing other than routine maintenance has been done on the vehicle. Is this normal "aging" of this part?

Thought I'd ask here first before exposing my ignorance to my friendly, local dealership.

Thanks for any input.

Karl
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  #2  
Old 02-04-2015, 05:37 PM
lanbrown lanbrown is offline
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That is the alternator and that is normal.
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  #3  
Old 02-04-2015, 05:59 PM
eeyore8 eeyore8 is offline
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Yes normal. Find something else to worry about
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  #4  
Old 02-04-2015, 06:14 PM
Socalx5er Socalx5er is offline
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Thanks for the responses.

Now I can move on to worrying about when the CEL is going to go off related to the SCR system.

Kidding....KIDDING....(kinda).

Karl
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  #5  
Old 02-04-2015, 07:33 PM
ard ard is offline
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You live near salt water? Could lead to a bit more corrosion.
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  #6  
Old 02-04-2015, 08:18 PM
Socalx5er Socalx5er is offline
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Yes, near the ocean. Of course, the alternator in our 10+ year old E39 is pristine. Go figure.
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  #7  
Old 02-04-2015, 08:50 PM
ninja_zx11 ninja_zx11 is offline
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Could be a Urea fluid spillage while filling the urea tank (as fill up inlet is close the alternator) that corroded your alternator.
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  #8  
Old 02-05-2015, 05:13 AM
PAX5 PAX5 is offline
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Post

Quote:
Originally Posted by ninja_zx11 View Post
Could be a Urea fluid spillage while filling the urea tank (as fill up inlet is close the alternator) that corroded your alternator.
Exactly what I was thinking!

I always protect engine and other areas when filling brake fluid. Maybe same precautions should be taken with urea fluids
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  #9  
Old 02-05-2015, 07:29 AM
FredoinSF FredoinSF is online now
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Could also be result of engine cleaning if aggressive degreaser was used.
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  #10  
Old 02-07-2015, 10:42 AM
speedracer g37 speedracer g37 is offline
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Pretty sure that's your turbo.

https://www.google.com/url?sa=t&sour...yyC59el14wA0-A
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  #11  
Old 02-07-2015, 06:03 PM
ard ard is offline
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Quote:
Originally Posted by Socalx5er View Post
Yes, near the ocean. Of course, the alternator in our 10+ year old E39 is pristine. Go figure.
I believe there are differences in how raw (ie "mill") aluminum can be treated. Maybe on the E39 they specified as passivation process or perhaps a different type of aluminum alloy... Then, as part of 'quality improvements' they determined that it was only an 'appearance attribute' and wasn't necessary. Less $$.

Oh, can I add that any question WITH a picture simply cannot be 'stupid'?

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  #12  
Old 02-08-2015, 12:29 AM
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serge1 serge1 is offline
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Quote:
Originally Posted by speedracer g37 View Post
I LOL'd
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