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Try Liquid Moly Motor Oil Saver. Need 2 cans for your N63. If your seals are beginning to harden this product will swell the seals and help defer the need to replace the seals. Worked for my N63 and my indy BMW shop uses this as well. This product will not work if your seals are gone. The way I see it no harm in trying. Also, normal to need to add a quart of oil every 1,500 to 2,000 miles. Since I used Motor Oil Saver, I've been able to go 3,000 miles before needing to add a quart.
For cars with really bad seals, my indy uses the 10-60 weight Liquid Moly. I'm told it stops the smoking. Most important thing with this N63 engine is frequent oil changes...5,000 mile intervals or less.
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