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10w 40 is what is recommended. Think Haynes recommends Duckhams QXR and you can get that fitted for 20 quid including Filter at National Tyres. Oil is £20 quid alone from your local Motor store so saves getting dirty, cold and keeps your knuckles in one piece.
Have used Total Quartz 7000 for top ups from GSF. Also used Castrol RS 0w40 and Mobil 1 15w50 fully synthetics and Castrol RS seemed to run best in my engine with least top ups needed. Mobil not so good in my experience and needs constant topping up.
Any Semi Synthetic or Full Synthetic is fine and as my change is due I am to replace the 15w50 Mobil 1 I have in for Duckhams QXR as its a no brainer at 20 quid fitted.