I've had one of those pneumatic mityvac fluid extractor for a few years now. I'm on my 4th one after snap on said they wouldn't replace any more of them, so I no longer use it to change hot oil. The first 3 I had sucked shut on themselves after a little bit of use and then once it had been pinched shut would do it everytime I used it afterward, hence the replacements. The 2nd one actually imploded on itself- loud as hell and made a huge mess since it already had about 5 quarts sucked into it. Since keeping oil out of it, the 4th one has lasted the last 3 years without sucking shut, but I guess that kinda defeats the purpose of it.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350