On my 2007 FLSTSC with 20,000 miles, the oil dip stick has blown off twice. Someone stole the original stick, & I replace it with a aftermarket one. The level showed ok after a oil change, but a mile down the road it blew the dipstick off. I think the stick may be different on the fill lines than the factory one. Someone said to look in the tank & see if the oil breather tube is covered. I've looked & don't see or feel any breather tube in it. Anyone know about this?