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May be good to also check the oil breather box itself. If the box is clogged, then eventhough the PVC valve, small and large hoses are clear, the engine will not vent properly. I believe you can attach about 1/2" size hose to the box (remove the S hose) and with the engine off remove the oil filler cap and you should be able to blow through the box. I've also read that one can check for PVC system working by lifting the oil dip stick and there should be no smoke when running. Perhaps, others can confirm if the dip stick test works.
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dnvolvo '89 765T 200K - '91 245 100K
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