By the way, I just checked the Mobil website. It seems there's a whole variety of oils. Which one to use?

Is this it?

Mobil Synt S 5W-40: http://www.mobil.com/UK-English/Lubes/PDS/GLXXENPVLMOMobil_Synt_S_5W-40.asp

Or this?

Mobil 1 ESP 5W-30: http://www.mobil.co.uk/UK-English/LCW/Products_Services/Mobil_1_ESP.asp

Or any of these?

http://search.exxonmobil.com/ledr/query_...ge%3A&ty9=w

Please let me know which one is suitable for a 997S. Thanks!