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Old 12-10-2008, 03:42 PM   #1
Dado 540
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Question Engine Washing

Hey fellas,

Do you wash you 5ers engines? How do you go about it, with all the electical and ECU in there it scares me to plash it with water.
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Old 12-10-2008, 04:18 PM   #2
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Ya I was wondering about this as well
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Old 12-10-2008, 04:21 PM   #3
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I just splash it.

I don't use any kind of pressure washers, just the hose
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Old 12-10-2008, 04:41 PM   #4
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^ i did the same..plus some elbow grease.
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Old 12-10-2008, 08:54 PM   #5
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What about the ECU, the starter, alternator, . . .?
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Old 12-10-2008, 09:42 PM   #6
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my friend just hoses down his engine then uses a cloth to polish it (taking off most of the dirt). He literally hoses down the whole engine bay, then gets to work... then just starts the car and moves on... it never affected anything. Mind you this is a honda civic, so I don't know if the same is correct for BMWs
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Old 12-10-2008, 11:02 PM   #7
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Been pressure washing the engine bay of both 5ers once a year since we got them. Haven't had any problems and it keeps the engine bay looking like this
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Old 12-12-2008, 04:04 PM   #8
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Pressure washers are generally better (because you use less water and can control the flow a bit easier). Just don't spray the electrical components directly, especially the ECU, throttle body, mafs, alternator etc. Seen a few cars get a bit of water in the intake (happened on my cadillac back in the day) - just let it run for a few mins and it should burn off. Just use as little water as possible.
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Old 12-12-2008, 04:15 PM   #9
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But pressure washers can potentially squeeze their way into seals that you don't want water to get into.

Use a mild engine degreaser and a paint brush to loosen the dirt.
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Old 12-12-2008, 04:47 PM   #10
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Brake caliper cleaner works well too.
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Old 12-12-2008, 04:59 PM   #11
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I use a pressure washer and dry it using compressed air....no problems here!
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Old 12-12-2008, 05:36 PM   #12
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But pressure washers can potentially squeeze their way into seals that you don't want water to get into.

Use a mild engine degreaser and a paint brush to loosen the dirt.
Yes, use a soft brush and don't hold the pressure washer for any length of time over any area with electronics. Use it in a quick back and forth motion over the area (hope that makes sense).
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Old 12-14-2008, 06:45 PM   #13
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Been pressure washing the engine bay of both 5ers once a year since we got them. Haven't had any problems and it keeps the engine bay looking like this

Sorry Dinan_M5 pressure washing is the worst possible way to wash your engine bay. The high pressure will eventually find a weak spot in rubber seals and destroy them. I always wash my engine bay with some type of degreaser agent followed by warm water and soap. After that I rinse the engine compartment and use compressed air to get rid of the remaining water.
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Old 12-14-2008, 07:06 PM   #14
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i use tireshine on all the plastic parts... hose everything else down.. turns out looking nice
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Old 12-14-2008, 07:10 PM   #15
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i power was the shit out of my engine bay in the e30, never had any problems, i normally just wrap a bag around my cone filter.
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