I have a 2003 Accord with the 2.4 engine.This is the first year for this engine in the Accord. My question is do you think it is possible that this engine was specificaly designed to use the 5w/20 oil and a thicker oil like 5w/30 could do harm.If the engine has tighter tolorences and smaller oil passages maybe the thicker oil would gum up the works so to speak. I am a new member here and a apoligize if this seems like a stupid question.I have read a lot of the old questions in this forum and it seems the more I learn the less I know.. Thanks