I have a new 2003 CR-V. After driving in the hot climate of Southern Arizona, so the engine is fully warmed up, if I stop the engine for a half hour or so, and then restart, I hear what I think is tappet clatter which stops after a few seconds. I assume this engine has hydraulic tappets and they are bleeding down while the engine is shut off. I don't think they should bleed down in a half hour. Anyone else? Comments appreciated. Carl