Hey guys, new to the ds, but I do have a commander. Just picked up a 08 ds450, went to look at it and took it for a ride, shifted through the gears and decided to buy it, didn't really get on it much since the guy lived in a town, but long story short get it home and let my buddie test it out and comes back and tell me I need to adjust the valves. Motor sounds amazing when idling, and few cranks on cold start and she fires up. When you actually get on it that's when you some type of weird...

Engine noise