S70 Knock sensor -- repairs tomorrow

[abscate]

Erik has had a charmed life with wheel bearings while a bunch of us in salt country have had lifetimes of 150k miles. That being said the wheel bearing on these cars are massive and will run another 20k mikes once they start growling, so wait for failure and then schedule the job at your convenience.

[erikv11]

Or, subscribe to a charmed life! With wheel bearings (don't get me started on oil cooler lines ...).

[FLXC90]

OP, yeah a rubber seal, that is, a metal ring and a spring in a groove of a rubber seal, designed to fill a specific void, and the pressure pushes on the inner lip of the seal, forcing a seal around the circumference of the void. And yes, cam seals go first, the PCV system vents crank pressure, if the primary path back to the intake manifold through the hoses off the canister are blocked or vacuum is not present (cracked lines or connectors) then the system blows pressure into the top of the motor through the hose in the spark plug area, and internally. the cam seals are the weakest link in this area, because of their location (top of the motor), and because over time the rubber in the seals has probably lost a lot of its elasticity due to heat cycles and aging. That's why the glove test on the oil filler is the primary check for clogged or failed PCV system.

BTW spending money freaks me out too! That's why you will find the resources here invaluable. If you can do your own brakes, you can do a lot more of this yourself (physical limitations not factored in).
You can find the info and confidence in these threads, and help if you get in a jam. And you'll find a lot more remaining cash in your possession, or more Volvos in your driveway