Quote:
Originally Posted by bmw335diesel
The fluid itself is not that special. It is a highly concentrated solution of ammonia and water. With that in mind, flushing the DEF tank should be easy with distilled water, available at any grocery store.
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You can buy the real stuff at autozone in 1 gal or 2.5 gal jugs for about $4.50 a gallon. For the amount we use, really is not worth playing mad scientist.