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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Radiator Flush Solution



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      08-23-2010, 11:12 AM   #1
Wosby
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Radiator Flush Solution

Is there a recommended "Radiator Flush Solution" to use with our precious BWW's? Or will running the car with distilled water for a while dissolve any of the mineral build up in the cooling system, before refilling it with my 50/50 coolant mixture?
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      08-23-2010, 11:29 AM   #2
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Flush not required, as there should be no build up. Last time I heard of anyone running a flush was back in the early 1990's.
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      08-23-2010, 11:58 AM   #3
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How did you drain the fluid? I saw in the bentley manual you need to drop the intercooler to get to the radiator drain?
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      08-23-2010, 03:06 PM   #4
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Haven't done a flush since the 90's. With back to back leasing and many life changes, haven't owned a car long enough to warrant a flush. With the BMW coolant and distilled water, you're saying no flush solution is required?
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      08-23-2010, 04:13 PM   #5
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IIRC the fluid is lifetime, and taking that into acount along with your car being ~2 yrs old I would think flushing would be unnecessary.
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      08-25-2010, 12:05 PM   #6
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Quote:
Originally Posted by Socom View Post
IIRC the fluid is lifetime, and taking that into acount along with your car being ~2 yrs old I would think flushing would be unnecessary.
If that lifetime words you are refering to from the stealership then its not a lifetime. BMW use the word life time as meant to only up to 100k.
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      08-26-2010, 11:19 AM   #7
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Quote:
Originally Posted by dragazn View Post
If that lifetime words you are refering to from the stealership then its not a lifetime. BMW use the word life time as meant to only up to 100k.
Yep.
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      08-28-2010, 07:03 AM   #8
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being that everything in your engine is either aluminum or plastic except for the 335 in which your center section of your turbo is steel..you really SHOULDNT have a buildup issue...that being said a simple drain and refill will be all you need to do a coolant "flush"
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      09-07-2010, 09:56 PM   #9
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bmw used to recommend coolant change every 4 years. now they say its lifetime. if you are going to do it drain the radiator and the block. they are both a pain to get at.
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      09-10-2010, 12:39 PM   #10
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Quote:
Originally Posted by Socom View Post
Flush not required, as there should be no build up. Last time I heard of anyone running a flush was back in the early 1990's.
+1 also you would need to flush if you used tap water and there was a build-up of mineral deposits.
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