i have been riding a ยด96 vulcan classic and just recently sold it and purchased the 2000 intruder lc 1500. so far i love the bike, great power and handling. my question is: is there any kind of major issue i should be concerned about on this bike? it has 28k miles and seems to have been well maintained. i bought it from the original owner. another question: his last oil change, he went to synthetic. before that he had always used 20-50 castrol. can i switch back to that without any problems? thanks, bud