I haven't lost any. Picked up with 4 miles on Mach 13, 2013, 1st service at 600 miles and DIY oil and filter change at 3,700 miles, now at 4,600 miles. I broke in using the easy on it method like Bill. Also like Bill...after that 600 I have been riding it fairly hard. At the 3,700 mile change I did find a small amount of metal on the magnetic drain plug (remember...there are two drain plugs!) I wasn't surprised as the motor didn't feel fully broken in until somewhere between 1,500 and 2,000 miles.