Just DEF problems

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I'm going to get my CDL next week, would someone mind explaining why this is a problem?

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its aesthetically unpleasing and it can cause permanent marks if your def tank is painted or has chrome trim

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i put the nozzle in my mouth and suck out any of the excess liquid to prevent it

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Its not. It leaves a white streak on the tank when it leaks and they always leak

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Every def nozzle I've ever held leaked when I pulled it out of the holder.

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Every damn time. If you’re not super careful and perfect it will drip onto the tank

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Every damn time. If you’re not super careful and perfect it will drip onto the tank