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I'm not a mechanic, but have done the PCV job. When the manifold is off (an not that hard) you do get a partial peek and could see crud(?) If PCV neglected badly, and dino oil used, then maybe the problem such as yours(?) have you used Synth oil? Also, have seen (but not on Volvos) running engine hot to loosen stuck rings(?) just ideas, no first hand knowledge. Vented cap is kinda red flag. Mileage not high at all. Rear main seal should go first if super clogged PCV -curious. If committed, then PCV fix might be worth it. I don't remember cost
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Farewell 'black manta' ('97 850) Hello 'rocket sled' ('06 V70R)
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