The book (owners manual) says to put the bike ('04 dl1000) on the side stand on level ground and check the oil level in the sight glass. When I do that, the sight glass is empty. If I hold the bike up straight, the oil level reads perfect. Is the book wrong or am I low on oil? It runs great but this is my first v-twin so I'm not sure what its supposed to sound like. When I changed the oil the dealer said it took 3.1 quarts but it would be ok to put an even 3.0 in it. Any thoughts?