15/50 fully synthetic in mine the last few years too. It rattles less when really hot.
Fully Synthetic 15W-50 Motorcycle Engine Oil Ultra 4T 4-Stroke 5 Litre 5L | eBay
Limitless Ultra 4T 15w-50 is a high quality fully synthetic motorcycle lubricant, which is formulated to provide ultimate engine and gear performance for all kinds of modern bikes. Limitless Ultra 4T 15w-50 exhibits excellent wear protection and outstanding resistance to oxidation.www.ebay.co.uk
+2 for this. Unbeatable value and I've used it for years.
