Oil change SMART ForFour 2004 - 2008 | Haynes Manuals
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Here's the sump plug
Don't forget to place a suitably sized receiving tray in place
Using a 13mm spanner or socket, carefully remove the sump plug and fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel and refit a new sump plug and washer
Do not over tighten