Quote:
Originally Posted by santo
Is anyone concerned about extra moisture in the exhaust system introduced by the DEF system? Is the exhaust system 'beefier' so that it won't rust faster? I'm just a little worried tHat replacing the system cat to back is going to be astronomical in price and perhaps a BMW service center only item because of the cost of the components.
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You alreadu have moisture in the exhaust system, since one of the byproducts of combustion is water (you can see it dripping out of the exhaust pipes under the right conditions). I cannot imagine the little bit of moisture added by the DEF will make any difference, particularly since it will be a vapor in an exhaust of normal temperature.