Coolant replacement - how to decide?
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I've changed mine every couple of years or so, by force or circumstance with this car (water pump, valley pan, expansion tank, and general phukkery). Im at 204,571 miles on her (and climbing at an average rate of 150 miles/day), so I must have done something right with this thing of mine LOL.
#12
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My Ride: Looking!
#13
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My Ride: 2010 535 IX
I'd really like to change mine every two years if I could find out how to drain it I can't find any information on where to drain it?
#14
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My Ride: 545i sport
Model Year: 2004
Coolant never gets changed on any of my 5 BMW's just to change it. Usually, the coolant never stays in the system more than a couple years before something causes me to drain the coolant to perform some sort of repair. But, otherwise, I would say 4 years is the life of "long life" coolant.
FWIW, on my 2002 Chevy Suburban, I never changed the coolant until the day it was sold in 2013 with approximately 160k miles. Never a problem with that truck...original water pump and all.
FWIW, on my 2002 Chevy Suburban, I never changed the coolant until the day it was sold in 2013 with approximately 160k miles. Never a problem with that truck...original water pump and all.
#15
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http://www.aaaradiator.com.au/media/...a/aaa-3252.jpg
Later radiators, such as my wife's 2009 X5, seem to have the drain eliminated and you need to undo the bottom radiator hose to drain it.
At least the N52 does not have block drain plugs, so all you get out is what comes out from the radiator. The N52 takes about 2 gallons if you drain the radiator and take off the water pump and thermostat. I buy one gallon from BMW and dilute to two gallons with distilled water. That is enough for a drain/refill.
Be sure you follow the bleeding procedure.
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My Ride: 2007 530i silver grey metallic
sport/premium/cold weather/xenon adaptive headlights/Logic 7/PDC/shades/navigation/M sport bumpers & side skirts/M5 stye 166 wheels
Older E60's had a red drain valve on lower passenger side of the radiator. Newer ones don't have that because they have a tendency to leak after just one open and close cycle. Best way do it is to remove the lower radiator hose. You'll get maybe 1/2 and will have to undo the plug in the engine block to get the rest.
You can check coolant condition by using a voltmeter. Ground one end and dip the other into the expansion tank. If you read .4 V or less coolant is still "good".
Not sure about lifetime, but when I checked after 60k it was well within usable limits (.15 volts).
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