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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 12-15-2011, 04:46 PM   #1 (permalink)
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Radiator Flush - how often?

A local BMW specialist is advertizing a special price on a radiator flush. I checked in my service manual and it says nothing at all about changing the fluid and the auto servicing system in the car doesn't track it. So how often do you guys flush the radiator?
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Old 12-28-2011, 02:48 PM   #2 (permalink)
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Well, like everything else ... it depends.
How old is your car? When's the last time you changed the coolant? Does your overflow bottle look like it has pretty and colorful kinda clear fluid, or is it more like a Progresso Beef Stew?
I flushed my 25 year old car when I got it. As long as I change the coolant regularly, and there are no head or intake gasket issues I may not need to do it again. BUT if I go to change the radiator again, just before I pull the old one I may do another flush. I use diluted CLR.
Most other flushes are either too caustic or too acidic. That means that while they're cleaning out your engine they're disintegrating gaskets, seals, sensors and thin plates. When you hear that someone had to change the waterpump because all that built up sludge was keeping it from leaking .. that ain't it.
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