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1983 911SC Black Oil When Drained

Engine

Vehicle Information: Model: 911sc; Year: 1983; Body Type: Coupe; Total Mileage: 118,000;

I wrote a few months ago about a problem I had on a 1000 mile tripthrough arizona in the summer. The temp was 104 and the oil temp got upto 260 for a 1/2 hour, and the speed had to be kept to about 85, notusing the air conditioner to maintain temps below 240 to 250. When Ichanged the oil after that trip, it was black. Since then, I have takenoff the front oil cooler and flushed it. I have changed the oil (Castrolracing 20-50) and filter (Porsche) three times at 3,000 mi. each time theoil is dark black. My mechanic says compression is great and theemissions are perfect. He has no idea why it's happening. He even gave mea an additive to prevent scorching, which made no difference. The carruns great. Any ideas?

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