Just for information...Spoke to Martin (Miller Oils Tech Dept)
Tel:- 01484 713210 re recommended oils for Scooby`s
Miller now recommend their XSS 5-30 semi synthetic ( 1st recommendation) or their XFS 5-40 as an alternative. I don`t know why they recommend their semi synth over their fully synthetic (Martin didn`t know either) but they do!. Only reason I can see is that it is a 5/40.
Obviously they also recommend Optimax petrol together with their octain Plus. You pay`s your money as they say.........