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Old 11-30-2010, 09:46 AM
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bimmerdiesel bimmerdiesel is offline
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Location: Chicago
Join Date: Jul 2010
Posts: 908
Mein Auto: 335d
Originally Posted by Snipe656 View Post
I was just reading earlier today on a MB forum that with their DEF systems they are supposed to be topped off I think it is every 10k miles and then flushed every 20k miles. The stated reason for the flushing though was to break out or avoid any crystalization issues. Wonder how valid of a reason that is and if it is valid then why they stopped draining and refilling the DEF during oil changes for these cars and now only top off.
Its not only top off. BMW also follows similar rule. They drain and refill on alternate oil changes. So under free warranty you will be entitled to 2 drain-refill
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