Hi Wang,
I don't think Rotax has a recommendation for this. T9 is just from my personal experience when I Mfg dive compressors that sat in salt water and from using it on boats and other water craft. I have used it on other engine around salt air on beaches. All have worked well.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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