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If you accidentally noticed oil consumption, quite normal, loss of traction, increased fuel consumption with a lean mixture, extraneous whistling in the area of the valve cover (crankcase ventilation valve), quickly dirty oil, a dirty throttle valve on the intake manifold side (in soot), as well as the crankcase ventilation pipe, then it's time to check the condition of the Crankcase Ventilation Valve (CVV) #valve #crankcase #gases #opel #astra #oilburner #oil #gtc #z18xer #gm #repair #engine #consumption #guide #investments #invest #money