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For the 2008 BMW 128i with a 3.0 L 6-cylinder engine, you can use either 5w30 or 5w40 synthetic oil. The engine holds 6.5 liters or 6.9 quarts of oil. When buying oil for your car, ensure it is the right type and look for the API Approval seal to confirm it is suitable for all BMW vehicles. You can switch between different types of oil but always ensure the engine is completely empty before refilling to avoid mixing them.
The recommended oil for the 2008 BMW 128i is synthetic oil with a viscosity of 5w30.