Oil change Opel Signum 2003 - 2005 | Haynes Manuals
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You will need to remove the cars undertray
Here's the sump plug
Don't forget to place a suitably sized receiving tray beneath
Using a Torx 45 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. Replace the undertray