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Use non-detergent oil at first. It helps the rings to seat. Drive gently, avoid constant engine speeds, keep it under 4000 RPM. Change the oil and filter after 500-800 miles. Switch to 10W30 or 15W40 oil of any reputable brand (I like Shell Rotella, a lot of people swear by Castrol) at this time. Continue the gentle driving for a while, after a couple thousand more miles you can take it to the normal redline.
The rings don't seat immediately. You won't get an accurate compression reading until it has done a few thousand miles.
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