Beware of using heavy oils on some hubs (mavic, in particular, but also these current crops of 3/6 pawl high engagement hubs). The springs in the old Mavic design are quite weak and it's easy to wind up with a stuck down pawl. The high-engagement hubs wind up with a slightly different problem: the pawls have so much surface area on the pocket side, that they will stick to the freehub body when they collapse.

All said, it's difficult to talk about 'loud' without setting some kind of standard as 'loud'. I know some people who are driven wild by DT ratchets, which are fairly quiet. They would almost certainly be driven to madness by a BMX race freewheel or a White Industries trials freewheel.