Speaking of Oil Change, ever use a vacuum pump system to change it?

[mrbigstuff]

Racer X wrote:
[quote=mrbigstuff]
sludge does not get removed by a typical oil change; one would have to go in and scrape it off.

anyway: the pump system doesn't help with changing out the filter, so I'm uncertain of the purpose of the whole thing.

Sounds like your experience is pretty limited.

Many engines have filters accessed from the top of the engine. Mercedes for example. On my Buick V-8s, I can grab them from the top, and drop them right down into the drain pan. Same with many Buick V-6 rear wheel drive applications as well.

I would only use a Fumoto-style drain valve in a very protected environment, like on a marine inboard, or a genset. All it takes is to high center once, and at best you need a new oil pan.
exactly.