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It should be a factor of how often you use the brakes. If you start the truck, it should fill and purge once, the not again until you use the brakes enough to drop the wet tank pressure low enough to engage the compressor(thats where it senses pressure). how long does your truck hold air when...

Where is your air feed from? Is the air feed between manifold or air filter, and the compressor clear and unkinked/distorted? restrictions there can cause excessive vacuum while operating and pull more oil past the rings… a little oil is normal, but if you have more than the normal leakage...