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The S90/960 drive train is the same as a 940, more or less. The independent rear suspension is a beefy bastard on that year. Awesome like an early 1970s Mercedes design. I'll guess yours also has the Nivomat self-leveling system, yes? How's the differential fluid? The rear suspension bushings begin to go at your mileage.
The S90 front suspension front torque rod bushings are suspect to fail and should be inspected recurringly. Read the 700-900 FAQ for info. I hope and trust you have a service manual like a Volvo green service manual or a Haynes? Chilton I guess works in a pinch. You can find Volvo green service manuals on CD or DVD on ePray (eBay).
At 150,xxx miles, you may want to look at your strut mounts. How are the ball joints? A ball joint that fails at highway speeds can result in a spectacular end over end crash and roll of the vehicle.
Also consider brake fluid replacement every two years and no more. Use the brake fluid your S90 owner manual recommends. I'll guess your 1997 S90 uses those single piston sliding brake calipers front and rear. These also require some inspection and service recurringly.
You must replace the engine coolant on time. I'll guess every two years. The Porsche-Volvo white block B3204 engine is a light aluminum alloy with pressed in steel (cast iron alloy) cylinders. There may be no brass in the engine. Only ferrous based and aluminum based alloys. So, use the coolant the Volvo owner manual recommends. You may want to contact the Volvo stealership or go to the Volvo site directly and look up any TSBs (technical service bulletins) Volvo Cars has issues for your year, make, and model. It may mean some free service, possibly.
With care the later S90s can last for a very long time. With neglect they'll fail yet you'll witness the deterioration first hand.
As Uncle mcintorb states, don't ever neglect the timing components (timing belts, timing belt tensioners, and associated bits.
Also, inspect and clean your PCV flame trap. Ensure no vacuum leaks on the air intake side. At 15 years and 150,xxx miles, some vacuum lines may be getting a little brittle at the ends, at least, and may need some attention.
Just wish these came with manual transmission in North America. You can re-tune the engines to the European market spec and enjoy a very sprightly and well performing engine ala the largest I-6 and small V-8 turbo powered Mercedes and BMWs. The can travel at very high highway speeds very nicely.
The Porsche-Volvo B3204 is an awesome engine. However, I don't consider it the logical decedent of the Volvo B30. Also, it is not an all iron-alloy engine block and cylinder head the BMW still uses as with their I-6 engines. Still though, the B3204 deserves care and reverence.
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