I've never really had much of a startup rattle, but after switching to mobil1 0w-40 I am getting a noise at startup that lasts for a few seconds and sounds very much like a knock. Oil pressure and level is fine. It happens about 4 out of 5 starts and only last for 5 seconds or so. Does this sound like the typical startup rattle or is it something to be concered about?
thanks, aaron
thanks, aaron