Going to change the oil on my 2013 k1600 GTL. Prior to this it has been done at the dealers. Is it necessary to remove the smaller secondary 5MM hex bolt? Removing the 8MM one is no problem. The thought of removing and losing the smaller one located up into the sump makes me a little nervous. What if I don't remove this one. Am I getting enough of the oil out to ensure a good change or is it necessary to remove both to ensure a complete change out. Thanks