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International Automotive Technicians Network
Re: Extended Parking and DEF
Posted to HD/Fleet Forum on 4/7/2020 1 Reply

As far as I know, the theoretical shelf life is one year, but it's temperature dependant. How long have these units been parked? A month or two? Probably not an issue. If it's been longer, the def lines are "emptied" at engine shutdown, so a drain and fill wou... Login to read more.

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