---
title: Why do I have differential oil coming out of my solenoids?
description: The number one cause of differential oil traveling up the ARB Air Lines is due to differential housing pressure. If the housing does not vent properly, pre...
---

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# Why do I have differential oil coming out of my solenoids?

The number one cause of differential oil traveling up the ARB Air Lines is due to differential housing pressure. If the housing does not vent properly, pressure will push the oil up the lines. To remedy this, check to make sure your factory breathers are not clogged or enlarge breather ports/hoses to allow more ventilation. ARB now offers a breather kit (170112) to help remedy axle ventilation problems.

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