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The 2001 Mercedes C320 requires SAE 5W-30 oil, and Mercedes suggests using full synthetic oil for optimal engine protection. It's crucial to use the recommended oil for your vehicle as it provides the best defense against wear and tear on the engine parts chosen by the manufacturer. There are two primary types of oil available - synthetic and conventional. Synthetic oil, produced in a lab, replicates the properties of conventional oil derived from petroleum using chemicals. Synthetic oil has a longer lifespan than conventional oil as it deteriorates more slowly in the engine. This means that typically, you only need to change your oil every 7,500 miles with synthetic oil compared to every 3,000 to 5,000 miles with conventional oil.
The recommended engine oil for the 2001 Mercedes C320 is the Pentosin synthetic motor oil in the 5W-30 grade, available in 1-liter containers.