You also want to make sure that the oil is up to operating temp before attempting to suck it out. We have a nice Tecalemit air powered suction machine at the shop, but it takes forever if the oil isn't nice and hot. I saw the Topsiders in Boat US for about $40.

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8
'72 Alfa Romeo 2000GTV
'73 Triumph TR6
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12