Compression is fine so I doubt it's the rings. I would say it's the valve guides in the head or it's leaking it. Half quart of oil ain't nothing. Even new cars can use oil. My 3.4 with 162,000 on it uses a quart in like 1,500 miles. I'm not worried. I had a Topaz that used a quart a week. Drove it for 3 years and never worried.
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