I've got a shop drawer full of them for when I inevitably strip them.

Lower hose is the way to go for draining as long as you don't have those shrink-fit hose clamps.

+1 on Blackstone Labs Their analysis will set your mind at ease, or give you some meaningful info if there is an issue. They also track your samples over time to give you an idea of how repairs are helping, or even help you anticipate failing components. They'll even tell you the level of shear, som...