The more I see European info the more 5w-40 oil vis. I see used on vehicles. Why are they promoting this so much ?. Their weather/climatic conditions don't vary any differently than parts of N. America. Where we get oil recommendations like 5w-20 and our dealers go all nuts on you if you suggest even 10w-30 to them (on my Honda k20 engine) European manufacturers and dealrs all talk about 5w-40 on the same engine, even in England where it doesnt heat up very much. Doesn't make any sense, confuses me. So what do you guys think of 5w-40 oil ?, in almost all cases this is a synthetic oil that is used at that vis.. Does anyone recommend this oil ?. The Havoline specs look pretty amazing on it, can be used in almost all situations I think. Any responses would be appreciated. thanks