* Check your owner's manual: This will specify the recommended viscosity (e.g., 5W-20, 5W-30, 10W-30) and oil type (conventional, synthetic blend, or full synthetic). Pay close attention to this information as using the incorrect viscosity can damage your engine.
* Viscosity: If your manual doesn't specify, 5W-30 is a common and safe bet for older vehicles in moderate climates. 10W-30 might be better for hotter climates. If you live in a very cold climate, 5W-20 might be suitable, but always consult your owner's manual.
* Oil Type: Conventional oil is the cheapest, but synthetic blend or full synthetic offers better protection and longer life. The choice depends on your budget and driving habits. Synthetic blends are a good compromise.
* API Certification: Look for an oil with an API certification (e.g., SN, SM). Newer certifications usually indicate better performance. Your owner's manual might specify a required API rating.
In short: Consult your owner's manual first. Failing that, a 5W-30 synthetic blend would be a reasonable general choice, but you should still check your owner's manual for the manufacturer's specific recommendation.
