If it's under warranty I would take it to the dealer, just expect it to be down for 2 weeks since they never seem to have any parts at the USA warehouse. check bolts for tightness on the suspension they are known to come loose from the factory. bushings seem to wear out quick for some. mine are still all good after a year and 250 miles but I did have to replace both rear wheel bearings. If you are handy most of the time it is easier and faster to replace the stuff yourself if you don't want the downtime. The oil from the factory is crap but it shouldn't look too brown that indicates water got in, was it overfull? May just be something to keep an eye on after you have good oil in it, I check the oil often as sometimes you end up in deeper water than you expected.