Hi and welcome.
If you click on Forums and scroll down to Traders, Parts for sale, most of what you need will be there. Some sites have the helpful option of entering your reg or full vehicle details which short cuts you to your requirements.
I've used several of them and not had any problems. There're numerous oils. My favorite but one of the most expensive is Millers CFS Nano Drive.
There're numerous others out there, Cox Motorsport, Europarts etc.
Regards.