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The service interval for the charcoal filters on the 210 chassis is 45,000 miles. If you don't want to do it, hey, it's a free country, don't do it.
I'd base the decision on how often you use the feature and how important it is to you to have the filters at peak efficiency. Someone with lots of allergies may feel differently than someone without.
I'm a "good German" though and try to get the owners to replace them on schedule. Every 45,000 miles or 4 years.
Gilly
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