What oil for Porsche 911 1980 use?

For a 1980 Porsche 911, it's recommended to use high-quality synthetic oil with a viscosity of 10W-40 or 20W-50, depending on the climate and driving conditions. Look for oils that meet or exceed API ratings for older engines, such as SL or SM. It's also important to consider oils specifically designed for classic cars, which can help maintain engine performance and longevity. Always check the owner's manual for specific recommendations.