i have had my '91 945t for 130k (now at 230k), and have never replaced shocks. for all i know they are factory. if i replace them, will i get a substantially comfier ride? i don't really care about a cushy ride, but it is an SE model and i think that means expensive nivomats on the back, right? will cheaper boges be ok? the car has leaned down on the left in the back since i bought it.

also, my steering is really strange lately. no clunks, just doesn't return to center the way i'm used to, and is loose and veers left fierce before car is warm, and slightly after warming. cornering is not precise, and is compensates bizarrely on turns. generally, it handles horribly and is almost making me feel unsafe, whereas i have always cherished the control and tightness of the volvo steering (to a fault). an addendum to this is that i banged into a tree in the snow (from sweden, horrible in the snow, go figure) and bent the front bumper (the airbag didn't go off, which actually made me happy), the problem was occuring before then but has worsened since. no damage was spotted other than the bumper being a couple inches back on the pass side. probably going to disable the srs and run into another tree on the driver's side to even it out.

i can't find the reason my crankcase pressure is so high (oil leaks at a rate of a quart per driving hour). replaced all pcv components and hoses except breather box, but gunk flows through box fine. oil light goes on and off regardless of oil level. op sensor is leaking a steady stream, should be coming in the mail today to be replaced this weekend. already replaced front seals, which were leaking. can't pinpoint if the rear seal is leaking because there is oil everywhere, including constant buildup on the rear hatch from blow-by. if i replace the op sensor, will that make it leak somewhere else because the pressure is trying to escape somewhere? for what other reason could there be so much pressure?

thanks for reading the longwinded q's, responses are thanked in advance.
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'75 164e(?), '87 240gl(350K), '84 240 gl(233K), '91 940se(228k+?)