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Synthetic Oil Change

Engine

Vehicle Information: Year: 1988; Engine (size, modifications): 32 valve; Total Mileage: 84,175; Transmission type: Autotomatic;

I am currently using Mobil 1 15w-50 in my 1988 928S 4. I changed the oil in October '04. Now, 15 months later, I have only put 2057 miles on the car since then. The oil looks almost as clean as when it came out of the container. I have been changing it every 3000 miles. I know the owner's manual says to change it every year even if you don't drive the recommended mileage, but I was under the impression this was meant for conventional motor oil, not synthetics. My car is strictly a weekend/special occasion cruiser. Is it okay to take this approach, mileage rather than months, to oil changes with synthetics?

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