My silver 950 is the funnest street bike I've ever had, but I have a couple of questions. Has anyone out there experienced the following: * Darkish coolant color? My dealer said KTM coats the inside of the radiator with something. Over time the coolant color has turned a really dark green. I'm not using any fluid... * Occasional chatter with oil light flashing when starting hot? The oil level is at the upper mark and it stops after I rev the throttle a few times. My dealer did use Elf Syn 10W40 at 600mi. Is the difference between 10W40 and 10W50 enough to possibly cause this? I do have Motorex Power Syn 4T 10W50 on the way. Thanks!