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I just got the Scag Liberty with the Kohler 22hp engine and now have 9 hours on it. I need to change oil and filter, can I use syn oil? Can I use Mobile 1 oil in it? Should I use 10w 40 oil?
Thanks for any suggestions on this, such a great mower.

hot climate SAE 20W-50 or SAE 10W-30 cooler climate

I recommend conventional 10W-30 for at least the first 50 hours of use to ensure complete break-in, then switch over to synthetic.

Kohler has a 300, hour extended life 10W-50 synthetic oil.

You can use whatever oil you like as long as it meets Kohler's minimum requirements and change at the recommended intervals. I use all sorts of oil in my Kohler engine. I've run 10W40 motorcycle oil, 15W40 diesel oil, and a mixture of leftover oils.