What is the recommended engine oil for a 2006 Ford Mustang 4.0?

The 2006 Ford Mustang 4.0L engine's recommended oil is typically 5W-20 in most climates. However, it's crucial to always check your owner's manual. The manual will specify the exact viscosity grade recommended by Ford for your specific vehicle and operating conditions (temperature). Using the wrong viscosity can harm your engine.

While 5W-20 is common, the owner's manual might suggest a different weight, especially for extreme temperatures (very hot or very cold). The manual will also specify the type of oil (conventional, synthetic blend, or full synthetic) appropriate for your engine. Don't rely on generalized advice; consult your owner's manual for the definitive answer.