roadrunner16ExplorerOct 20, 2014DEF addativeI'm thinking about getting a Sprinter RV and have ? about this additive called DEF or DIF. What's the general cost per gal.? How much dose it hold? How often do you have to fill it up? Plus any ot...Show More
tmmarExplorerOct 20, 2014I use roughly 1 gal of DEF every 400 miles or so and buy it at flying J. They have pumps and charge about $2.75/gal. My DEF tank holds 13 gallons.
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