You should speak with Mr. Upson. He fixed his worn timing chain and actuator problem by . . . wait for it . . . replacing them with new components. I can let my car sit for a week and it doesn't make that horrible rattle at startup.Remember that this noise only happens after sitting for days. I just cranked it over with the throttle floored to build oil pressure before starting and the rattle noise was virtually non existent. Joseph Upson had the same rattle and claims that 10w40 solved it for him. His theory was that poorly controlled actuators during low oil pressure startup (they unlock at 15 psi). It seems plausible to me.