I swithced to Rotella's 5W-40 syn at about 3500 miles. Bike now has about 4500. I was checking my oil level this past weekend and couldn't see any. I have the bike level buy using a level across the handlebars-no oil level. I start the bike up and oil shows up on the site glass. When I shut her down the oil disappears???? What is the deal with this site glass. Since I just changed the oil 1k mile ago I hate to drain it just to see if it has the right about of oil. I can't imagine that I've burned up 3 qt of oil in 1k miles. Any suggestions?