Do 850 have PCV valves? If so, where is it located and how often should it be changed? Second, any ideas on what would be causing the flame trap to become soaked with oil. I clean it every other oil change and this last one I noticed alot of oil around the flame trap and in the air intake hose. I know there is usually some oil to be found, but there was alot more than normal. I hope this is not a sign of major repair$.