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Randy is right about checking the flame trap and the associated hoses and nipples. In addition, there is an oil box underneath the flame trap that can get clogged. Take a look at the 700/900 FAQs for more information on the crankcase ventilation system and some troubleshooting: http://www.brickboard.com/FAQ/700-900/Engine-SealsBeltsVent1.shtml#Crankcase Ventilation: A Treatise
Also look at Michael Ponte's page with great instructions: http://www.mikeponte.com/volvo/oiltrap.htm
Hope this helps.
Mike Brown
Greenville, NC
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