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I'm not sure why an engine would start burning oil if over-rev'd.
Could loose compression and loose power certainly. (bent valve/weak valve springs)
To a previous question-if you are expecting long life from the engine - my opinion is the redline is the redline. If you plan on swapping valve springs or other upgrades, then running the car to fuel cut (believe it is 6600) is ok, but don't expect 100,000 miles out of it. At my level, I certainly don't see an advantage of exceeding redline.
On the road course - I never attempt to exceed redline - I wonder if the factory tach is dead on as the PDR is as I've seen my recording show a few incursions into the red zone which I hadn't noticed during the drive...I consider that a personal foul.
It can be an advantage at an autocross to extend the available rpm, but than again - expect some losses some day.
Absolutely no reason for a downshift to carry the engine into redline...just sloppy driving.
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