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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Incorrect screen wash concentration allows bacteria build-up which blocks the filter



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      07-22-2011, 09:52 AM   #1
BanziBarn
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Incorrect screen wash concentration allows bacteria build-up which blocks the filter

Hmmmmm..... Really?! BMW must use rubbish filters if bacteria can block them.

I've driven some cheap cars in my time but never had a bacteria build up block my filter.... until now.

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      07-22-2011, 12:13 PM   #2
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Pls tell me they didn't try and blame bacteria build up................I've heard everything now
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      07-22-2011, 12:41 PM   #3
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I always use neat screenwash, no probs, helps with the summer bugs too
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      07-22-2011, 12:49 PM   #4
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i was told i had a foreign object in mine

but we could clean it out for 165 pounds ,
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      07-22-2011, 02:49 PM   #5
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Phoned BMW customer services to complain about being charged 70 quid to unblock it, they phoned the dealer and then left me a message with the bacteria excuse!

Will be calling back.....
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      07-22-2011, 05:30 PM   #6
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for 70 pounds i bet they have not done a full strip down

just stuck an air hose in the washer bottle you're know in about a month if the washers stop working again
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      07-23-2011, 01:25 AM   #7
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BMW Wischwaschanalage

Quote:
Originally Posted by BanziBarn View Post
Hmmmmm..... Really?! BMW must use rubbish filters if bacteria can block them.

I've driven some cheap cars in my time but never had a bacteria build up block my filter.... until now.

Actually not true. a bad filter won't block, because its not filtering anything.

The thing about bacteria is they can multiply very quickly....doubling in number every half hour in ideal conditions and forming a sludge, which coats the surface of any effective filter, allowing nothing more to pass.

Jet fuel for example contains an antibacterial to inhibit bacterial growth which would otherwise block the jet engine's fuel atomizing nozzles.

Using neat washer fluid is just a waste of money and not even the best way to clean the windscreen. The cleaner needs a certain amount of water to work optimally. The organic phase of the cleaner removes fatty deposits from insects while water removes the road grime. With just the washer fluid you'll end up needing far higher volumes of fluid to get the screen clean, due to the fact that it only dissolves some of the deposits. In addition, in winter when you're heating the screen, neat washer fluid will evaporate far too quickly, leaving a very dirty screen which then requires multiple washes.

In the end, diluting BMWs own fluid to the get the required cleaning and anti-freeze properties is the best 'solution' I've found. Last winter, when many cars were stopped along the highway with frozen washers and dirt screens my washer fluid remain just that, fluid.

This post was sponsored by.........

Just kidding
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      07-23-2011, 03:27 AM   #8
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Certainly truth in the change and blockages caused by washer fluid. Seen it just like jelly in some cars, in years past.

I think part of the issue is how much we use and whether it is sitting there for months.

I suppose BMW will guarantee their fluid as being suitable, whereas how do they control the quality of aftermarket product? Fair point, on using alternative washer fluid, if they are expected to foot the bill for blockages.

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      07-23-2011, 08:40 AM   #9
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Very interesting. So, it seems it was a valid charge?

ps, they said they took the wheel off etc so hopefully not just a pressure blast fix.
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      07-23-2011, 10:27 AM   #10
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      07-23-2011, 12:27 PM   #11
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[quote=SteveC;]

"Jet fuel for example contains an antibacterial to inhibit bacterial growth which would otherwise block the jet engine's fuel atomizing nozzles"

Ah, good old Cladosporium resinae, actually lives in water and feeds on fuel and tank sealant. (do your water drains regularly)

Not heard of it infiltrating BMW washer tanks yet but anything is possible.
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      07-24-2011, 06:11 AM   #12
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Quote:
Originally Posted by DrunkenMonkey View Post
Good thread, thanks.
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      07-24-2011, 06:47 AM   #13
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If I fill mine with 50/50 methanol and water... what will that do?
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