1. Engine Type:
- Gasoline Engines: Most modern gasoline engines require synthetic or semi-synthetic oil. Synthetic oils provide better lubrication and protection for engines with high-performance requirements, while semi-synthetic oils offer a balance of performance and affordability.
- Diesel Engines: Diesel engines generally require specific heavy-duty diesel engine oils that can withstand the higher pressures and temperatures found in diesel powertrains.
2. Viscosity Grade:
- The viscosity grade of an oil refers to its thickness or flow resistance at different temperatures. It is typically denoted by two numbers separated by the letter "W" (for winter). The first number represents the oil's viscosity at low temperatures (cold cranking viscosity), and the second number indicates its viscosity at high temperatures (operating temperature viscosity).
- Consult your vehicle's owner's manual or the manufacturer's recommendations to determine the appropriate viscosity grade for your car. Common viscosity grades include 0W-20, 5W-20, 5W-30, and 10W-30.
3. Performance Standards:
- Look for oils that meet the required performance standards specified by your vehicle's manufacturer. These standards are typically indicated on the oil container and may include classifications such as API (American Petroleum Institute) SN, SN Plus, or SP (for gasoline engines) and API CK-4, CI-4 Plus, or CJ-4 (for diesel engines).
4. Brand:
- Choose a reputable oil brand that meets industry standards and has a good track record of performance and quality. Some popular oil brands include Castrol, Mobil 1, Pennzoil, Shell, and Valvoline.
5. Mileage:
- Consider using a high-mileage oil if your car has accumulated significant mileage (usually over 75,000 miles). These oils are specially formulated to reduce leaks and consumption and provide added protection for older engines.
Remember that the best way to ensure you're using the correct oil is to consult your vehicle's owner's manual, which contains specific recommendations based on your car's make, model, and year. If you're unsure, you can also contact the manufacturer's service center for guidance.
