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Always use the correct weight oil. If you mean can you use high detergent oil in an old car that recommends non-detergent oil, the answer depends. If this car used non-detergent and has never been overhauled, it may be unwise to use HD oil. The HD oil will start to clean out deposits in the engine which may clog oil passages. However if the engine has been overhauled then by all means start using a modern HD oil.

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