Correction
Just to correct a previous member....
The new models definitely take a special Power Steering fluid.
You can put this fluid in the older models using ATF with no problems. Please do not put ATF into a newer model.
When in doubt use the proper Steering fluid from MB. The cutoff was different from model to model and I cant quite remember the exact dates.
Stay safe, I think your 400e needs P/S fluid.
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