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One big issue for infrequently used cars is the oil can accumulate water from condensation, just the the gas tank. If you drive it far enough too get the engine up to full operating temp, the water will evaporate. If you have opened an oil fill cap and see a milkshake goo on the cap, you have moisture issues. The 911 being air cooled takes a long time to get warm in the cold winter months.
I drive my 911 5,000 miles or more each year, and I do 8 to 10 autocrosses, and a track day each year. I have no issue changing oil after just 5,000 miles. My daily driver, 1986 El Camino went 300,000 miles on the original 305, before it was simply worn out at the valve guides and rings and was smoking. I swapped in a brand new 350, and took apart the old 305 just see if the inside of the engine was clear of sludge.
It was remarkably clean and had no sludge at all. I changed the oil at 3,000 miles. For my 911, I usually change it once in the spring, and that is usually 5 to 6 thousand miles.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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