Fully Synthetic oil - Motrio Super Extra 5W40 - 5 litres for under £16! (Not online, from Renault dealer) £15.35
Surprisingly cheap fully synthetic Motrio 'Super Extra 5W40' oil. 5 litres for £15.35 inc vat.
Well, I was surprised anyway as this is from a Renault dealer (Arnold Clark). Something similar in Halfords (own brand) is £34.99. Tesco own brand fully synth is £18 for only 4 litres.
Has all the right qualifications - ACEA A3/B3/B4-04, API SL/CF. NB according to the spec sheet not suitable for VW Pumpe Duse or cars with particle filters.
Anyway, it's called 'Super Extra' so it must be good ;-)