R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

checking PS fluid level

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Old 08-02-2024, 06:30 AM
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R 320 cdi
checking PS fluid level

I find mixed feedback on whether to check the PS fluid level with the engine running or not. What is the proper method?
Thank you.
Old 08-04-2024, 09:03 PM
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2010 ML550 VIN WDC1641722A564750, 2010 B180
Do both. the gap between max and minimum is very small. Power Steering fluid does not expand so much that you will overfill it due to heat expansion. Fill it cold to the minimum, turn the wheel from lock to lock a few times. Recheck it and top up if required to min level. Then go for a drive and heat it up. Recheck and top up if required to full when hot. Add a little at a time. The reservoir doesn't hold that much.
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I appreciate your feedback. I find it odd that MB has min/max fluid levels for cold/hot that are so close. Plus, its not easy to read the mini-dipstick since the fill marks are so close to each other.

My question is should I check the fluid level with the motor running or not? I've seen it done both ways on youtube videos.

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