# Pressure washer lubricants

**URL:** <https://boards.straightdope.com/t/pressure-washer-lubricants/718310>\
**Category:** Factual Questions\
**Created:** [April 22, 2015, 8:56pm UTC](https://boards.straightdope.com/t/pressure-washer-lubricants/718310 "2015-04-22T20:56:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bmasters1](https://avatars.discourse-cdn.com/v4/letter/b/b5e925/32.png) [@bmasters1](https://boards.straightdope.com/u/bmasters1)\
**Post date:** [April 22, 2015, 8:56pm UTC](https://boards.straightdope.com/t/pressure-washer-lubricants/718310/1 "2015-04-22T20:56:04Z")

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We have a Comet ZWD3540G-K on our pressure washer, and I need to know what kind of hydraulic fluid or other lubricant to put in it, because I’ve checked it, and it’s beginning to get low. We went to the site, but they won’t tell you what kind of fluid to use. I don’t know if it’s oil, hydraulic fluid, or what.

Thank you!