[san rensho]

Classic start up rattle. My car does it, if you do a search, you will find that it's very common. I don't know where it comes from. All kinds of theories, chain tensioners making noise until the oil pressure builds up or valves rattling until oil pressure builds up. I've tried all kinds of different oils and viscosities and nothing seems to make it go away. Ive learned to live with it. I wouldn't worry.