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I have been taught to drain the tanks at the end of every day so as to help prevent water and or oil from compressor getting into the complex valves that trucks rely on these days. Oil mixed with the condensation becomes a thick sludge and can gum valves completely over time or slow the normal operation of the valves down. Gear changes or brake systems rely on good efficient operation of many air valves specially late model trucks.

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Q: How often should you drain air tanks on a semitruck?
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How often do you drain air brakes?

You are supposed to drain your tanks daily, especially if your truck has only two tanks, and doesn't have a wet tank.

Is there a drain plug on gas tanks?


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On a lot of the VHD and VNL series (and it should be the same on the NH/FH/FM series, there's three air tanks under the door on the left side of the vehicle.. the first one should have a cable you can pull to drain the primary (wet) tank.

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