One other point, when yall fill the tank fill it up completely around 5 gal. There are sensing rods in there that figure out the level, sending a display to your dash readout. If you dont fill to top it still may show 100miles. Throws everthing off. Also after filling it will reset the display after a few engine start cycles. I used to add def when I changed the oil, but its better to add when the display indicates the low level. Just my experience. Ed K
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