Oil change Jaguar S-Type 1998 - 2007 | Haynes Manuals

You will need to remove the undertray

Undo the fixings using a 10mm socket

General location of the sump plug

Here's the sump plug

Don't forget to place a suitably sized receiving tray in place

With an oil catchment tray in position, use a 13mm spanner or socket to 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 re-fit the sump plug and washer. When the sump has emptied, wipe clean the sump plug area with a paper towel and refit the sump plug and washer

Replace (new) sump plug and washer. Do not over-tighten. Replace the undertray