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Taste it.....synthetic has a sweet taste and regular oil taste bitter.....joking. No real way other than asking the seller and hopefully they are truthful.
I don't think there is a problem running dyno oil after using synthetic, but as earlier stated for a couple bucks and the lower temps on My Sportster I went with the Mobil 1 15-50wt. Wally-world jugs for $22 . Problem is Wal-mart ain't selling those flavor jugs anymore.....WVleo
If your bike was new, it will be regular oil. Screaming Eagles (SE) are the only bikes shipped from the factory with synthetic oil. It is safe to mix synthetic and regular oil.
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