5w 30 magnatec would be fine I always go for a JASO or API rated brand of which Castrol do tend to have those - as a member you can get a discount from Opie Oils their ebay model search engine gives a few options
http://stores.ebay.co.uk/Opie-Oils/_i.html/_i.html?submit=&_nkw=%28161174144409,161174144494,161174144559,161174144566,171194827777,171194827839,181281326322,181281326323,181281326356,181281326417,181281838190%29