You'll find that just about any oil that meets Suzuki's specs will satisfy your Burgman - synthetic, "regular", or blended (semi-synthetic). The real advantages with syn oil is that it will last longer between changes as the base stock is pure(er) with no parrafins, waxes, or other molecular contaminants. Syn oils will save you a bit on fuel consumption as well cause they are easier to pump thru the engine. Just use a GOOD oil filter with any oil you choose. The Suzuki OEM filter, NAPA, WIX, etc. There are many threads and discussions regarding oil and oil filters, so just jump in, search and read. If you are looking to 'try' a good synthetic motorcycle oil, you can't go wrong with RedLine (most motorcycle shops carry it) or the Mobil 1 10w-40 motorcycle oil (I believe it's marketed as 'racing oil' but works very well). I have found that LUCAS Synthetic Motorcycle oil gives me good service as well. But Castrol and Valvoline also make good motorcycle oils. Don't use any oil that has 'additives' to enhance it's 'slipperiness' as that is not good for a wet clutch. So you have a selection. Enjoy!
HI llnelll here just bought a high mile Burgman 650an 48,000 mi. Bike is in excellent shape and rides like a dream. I intend to change the oil soon and wanted to get an opinion on using synthetic blend after this many miles. Also would love to here from any other riders with high miles to re enforce my opinion that I did not make a mistake buying a burgman with this many miles on it. Thanks