I have a new bike with a Shimano Deore drive train and it's noisy. I've adjusted it as per the infinite wisdom of youtube and I'm pretty sure it's working as it should - clean shifts etc. The chain is sitting squarely in the middle of each gear. Although it came with some oil on it, I've lubed it up with Finish Line Dry Teflon. Yet, when I pedal it seems to make a lot of mechanical noise. There also seems to be a bit of a pattern to the noise. The bike has under 10 km on it - should I just give it some time to break in? Or could something be defective?