Many years ago, chains were employed to transmit motion between the engine crank and camshafts but these tended to be located within the engine...
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Automotive emission controls became a hot button issue in the 1970’s. Manufacturers, faced with the challenge of reducing emissions, added devices...
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The first and most common way is not planning down time for your car. Usually you end up going where it is the quickest and closest or you have a coupon for a cheap oil change.
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