check the link i gave you for lots of info on these cars.lots of faqs in the technical section.
but do not forget to change the pollen filter aswell.this is often over looked EVEN at the dealers because its a pain in the wotsits to do
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its a pd engine you have so YOU MUST make sure you use the correct specific oil for these cars,air filter will take all of a minute to change
oil change is a P.I.A to do as it requires the under tray to be removed,UNLESS you have an oil extractor,this is the 1 i bought,
http://www.mptools.co.uk/products.asp?partno=104616
if you get 1 make sure you straighten the pipe before use,numbnuts here didnt and it curled out of the sump
so i was sucking air for about 5 days
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to do the oil filter you have to remove the engine cover and iirc you will find it next to the engine on the right,something like a 60mm socket is required?or a large pair of adjustables,but be careful its made of plastic.
any more questions just ask.