Works well (except for the 6.9 with dry sump). I needed to be shown...used it then removed the drain plug, got only a few more drops, haven't looked back. You can get one at a marine supply house (Boat US, West Marine, etc). I use one called "topsider" for the last 15 years.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon