A prospected buyer had my 1994 150XR6 Merc checked out by his Mechanic today and the mechanic said that I have a 22% blow by in the #5 Cylinder. The compression checks come back at #1 130, #2 125,#3 135, #4 140, #5 135, #6 145. Any ideas on the high Blow By and is this a big concern? I have...