Nothing wrong with synthetic motorcycle oil. Most of the confusion comes from people using synthetic car oils with friction reducing agents (labelled 'Energy Conserving') which will knacker your wet clutch in no time - Just ask steveD! If buying synthetic, make double sure you check it is marked JASO MA2 which is suitable for (and tested on) motorcycles with wet clutches and shared lubrication of gearboxes and engines.
Question is, does the XT need (or benefit) from synthetic? Probably not. IMHO, save your money and get a good quality semi (like the Motul) and change it often.
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