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      12-05-2018, 03:45 PM   #1
LevinBR
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35i Owners; How Often do you Top Off Coolant?

I seem to have to top off my coolant once every 6 months. My local dealer says this is normal, even for new cars. What's your experience?
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      12-05-2018, 06:18 PM   #2
themishmosh
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I've topped it off probably 2 times in 3 years. Once every 6 months where it gives you "coolant low" seems a little much.
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      12-06-2018, 03:07 PM   #3
mcdanielvzw
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I did it on 3/8 and 6/20 of this year. I've had the car since 07/17 though.
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      12-06-2018, 03:47 PM   #4
daytona90t
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I just recently had to add about 2 cups. Hadn't checked since back in May when I replaced the exploded coolant tank. I believe that temperature change can have a slight impact on fluid level over time as well. It was in the 70s when I last filled and bleed the system. Now it is in the 30s-40s so I wasn't too concerned about the lower level. Both my ZHP (M54) and X3 (N52) also have to be topped off about twice a year.
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      12-07-2018, 03:48 PM   #5
Xdrive35i2014
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never.
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      12-09-2018, 12:17 AM   #6
darkrom
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Twice this year. I do around 40k miles a year.
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      Yesterday, 10:08 PM   #7
NemoX1
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Once in 15k miles of ownership after a track day.
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      Today, 09:33 AM   #8
bvanlieu
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Not normal. Check expansion tank for evidence of bleed off. Our tank showed dried residue by the cap and eventually the seal in the middle failed and you saw dried trails on all sides of tank.

New tank installed (went after market since quality german part failed in < 50K miles...)

- b
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