4) PCV:
This one also short and sweet. PCV puts many cars in the crusher. The factory fit system is undersized after cars get outside warranty mileages and clogs. Crankcase pressure builds, blows seals and the job to repalce these cheap as chips seals is so involved (likley the transmission is coming out) to be non-viable. Cars at 120,000+ burn oil or still have less than ideal pressures with factory repalcements. There's many ways to do this. Worst way is to fit more of the same parts that caused the issue in the first. Particualry as the engine is now getting tired, so needs an PCV upgrade. Numerous threads but this one is top of the tree
https://www.matthewsvolvosite.com/fo...ic.php?t=53448
Until i did the mod. shown in this link, mine still burnt oil. £100 odd for a few bits of hose that kills these cars? - don't buy it, factory kit is overpriced junk, amounting to a few tubes. Works fine for the first 100,000. Hose is Hose. If you
drive the thing, ie 150,000+ do it for less and do it better following the link above. Then stick to fully synth oil. Saves a fortune in oil too. Note: Race cars have pumps to reduce crankcase pressure for a reason, can't recommend thsi mod highly enough.
How to check yours:
https://www.youtube.com/watch?v=FIRoc0VxLd4: