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a four cylinder engine in a small car usually holds what 4-6 quarts? At 4 bucks (for spendy oil) is 24 dollers for a 6 quart engine. Throw in an oil filter at 5 bucks and you are looking at less than 30 for an oil change. If you go to 7000 miles on an oil change you are looking at less than half a cent per mile in oil. Oil is not much of an expense to begin with.
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