Hello everyone. I wanted to see if anyone was having the same issue as I am having. I recently changed my 07 Venture over to Mobil 1 with a Mobil 1 filter. Upon start-up, I hear an inordinate amount of "clatter" from the top-end of the engine. I don't think this occured to this extent while running the petro Yamaha oil. I'm running 3.5 qurts of 10w-40 Mobil 1. Is this normal or should I switch back to the conventional oil? I'm not looking for a this oil that oil argument, just looking to as "why" my engine is making so much noise for the 30-45 seconds after start-up. THe bike has 2500 miles on it. Thanks everyone for your time.