Yesterday I started having overheating problems with my bike. I've had it for a couple weeks now and put over 1000 miles on it with no problem. I never had a problem with the bike overheating. Normally, it would stay at 3 bars, and every once in a while it would get to 4 if i sat in traffic. I was actually wondering if my fan worked because I had never heard it turn on. Well, now I'm getting up to five bars and the coolant overflow is spewing antifreeze out the hose onto my back wheel when I sit in traffic. This all started as soon as I changed my oil. I put in mobil one 15-50. My friend thinks that is the problem and that I should use genuine kawasaki oil. Any ideas?