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I use Castrol Edge 10W/60 fully synthetic for the road and competition work (£43/4ltrs trade price). I don't use any cheap/mineral oils even in my lawn mowers and have used fully sythetic for the last 30 years with excellent results. Whilst I have heard of Brad Penn and Swepco oils they are not readily available in Europe. The classic performance oils are from the usual manufacturers such as Mobil 1 but Silkolene, Millers and Duckhams are local manufacturers that provide top quality oils.
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