Part of the reason you may have a problem finding 20W-40 "Semi-Syn" is that you are looking for that exact Viscosity and the words "Semi-Syn".
The fact is that Polaris is using an old marketing ploy with 20W-40 so you are forced to go back to the OEM... A high quality 10W-40 will actually give you better lubrication at start-up and is still a 40 wgt at operating temp.
Along the lines, "Semi-Syn" would be the same as most oils "Full" or "Fully Synthetic". Those words mean that the oil is a Hydrocracked oil usually mixed with a petroleum and/or they have less than 30% Synthetic base stock.
Here is what you need: API SG or SG/SH. A higher API such as SH,SL, SJ, SM May be used but must then carry the JASO MA or, better yet, JASO MA 2.
If the oil has those Ratings, it meets the Minimum OEM recommendations although, I always recommend a Motorcycle Specific oil.
Oil, is the Lifeblood of your engine. The oil filter, is the Kidney that keeps it clean.
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