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Just to elaborate a bit on short trips and oil contamination. The combustion process itself produces water vapor, which can condense with short trips (not burnt off), that water can combine with sulfur (also a byproduct of combustion) to form a sufurous acid....which in turns tends to break down oil. There are other combustion by products as well. Fuel, water and acids not burnt off contribute to the dreaded sludge you find in engines that are driven short distances and with infrequent oil changes.
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