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Never seen a 5w50. Only seen 5w40 and 15w50. You don't really need to go as high as 50, 40 is fine. and 0w is apparently too low for UK so 5w is fine.... hence 5w40 is what most people need unless you have new VW's etc taht require 0w30.
Just read some oilman posts and you will find out all you need to know. They are quite informative.