Make sure the car definitely isn't leaking oil. Park it over some cardboard and let it idle - see if you've got any drips.
I'm not sure if this engine has an overhead cam. Overhead cam=more difficulty in most cases.
Replacing the rings is a pretty big job. You have to remove the intake, cylinder heads, oil pan, and pistons/connecting rod assemblies.
Oil leaking past the valves is very likely. The rubber seals start to crack and dry out at that mileage. That's still a pretty big job, however it's less intensive than the rings. The best thing to do is have the cylinder heads replaced.
Dave
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