Quote:
Originally Posted by JCL
Crystalization is described as normal on external components (ie where it is filled) but not normal on internal components. It occurs through migration by capillary action, according to the DEF industry.
Flushing and filling is to ensure that the fluid is effective in reducing emissions in the tailpipe, so that the vehicle continues to meet the emissions regulations.
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Thanks for the clarification. So simply draining and refilling with fresh fluid would meet that constraint.
BUT it appears BMW located both DEF tanks is not-so-handy locations for simply draining them.
Perhaps that is why Craig got to witness a messy flush-n-fill machine in action
Funf Dreisig