I've been using 10-30w synthetic oil for years with great results. You'll find it makes shifting gears much smoother, but it may also leak a bit more if your seals and gaskets aren't sealing well.
Also, be careful when removing the little phillips head screws fom the oil filter, as they are very easy to strip. Use an exact fitting phillips driver and smack it with a hammer before attempting to loosen. Maybe even try to tightening it a bit to break it loose first. Spend 10 bucks and buy one of those multiple bit driver sets - you will use the others for different screws on the bike. A manual impact driver and one of those cheap butane torches is very handy to have as well in order to shock those stubborn fasteners into submission
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