My mom has a 06 VTX1300R that began to use oil last summer. It was a very intermittent problem. The most it used was 1 qt in approx. 400 miles, then it would stop for a while then start again. They re-routed the crankcase breather and drove it for the end of the season. When it did use the oil there was nothing that came out the hose. There are also no external leaks on the engine/tranny. Has anyone else experienced this? Did a search but did not find any answers. I am thinking rings but it seems odd that it is intermittent. Is there a PCV valve on these that may be getting stuck? The pipes are dark as well as all the plugs. When it is in the garage and you crack the throttle you can see a bit of a dark cloud coming out the pipes. Thanks in advance for any suggestions.