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For your 2005 BMW X5, you can use either 5w30 or 5w40 synthetic motor oil with all engine options available. The 3.0L V6 engine requires 7.9 quarts, the 4.4L V8 engine needs 8.5 quarts, and the 4.8L V8 engine also requires 8.5 quarts of oil. It is suggested to change your oil every 7,500 miles or annually, whichever occurs first, to enhance engine life, improve gas mileage, and boost performance. Regular oil changes are crucial as synthetic oil helps keep engines cleaner by capturing debris and deposits that can harm engine components as oil circulates through the engine.
The 3.0i model features a straight 6 engine, not a V6.
BMW confirms that for the 2005 BMW X5, both 5W30 and 5W40 synthetic oils are suitable for the engine choices. The 3.0L V6 engine requires 7.9 quarts, the optional 4.4L V8 engine needs 8.5 quarts, and the optional 4.8L V8 engine also requires 8.5 quarts.