i think a few people are missing the point here. handbook for 197 says it requires 5w 40. closest garage to me is the dealer. they dont stock any. the guy at the counter agrees it needs that oil but coughs that they use 10w 40. in my opinion thats wrong. i dont give a toss what the physical differences are. again let down by a dealer who dont stock a part that they have printed and they would invalidate you warranty if you took them a seized engine due to lack of oil. edde i apologise for telling you to sod off, but your posts seem to be aimed at creating sparks for an argument.