* 10W-30: This is a good all-around choice for most climates. It provides easier starting in colder weather while still offering adequate protection at higher temperatures.
* 20W-50: This is a thicker oil, often preferred in hotter climates or for engines with higher mileage where there might be more wear. It provides better protection at high temperatures but can make starting harder in cold weather.
Always check your owner's manual. The manual will provide the most accurate and specific recommendations for your particular 1979 Corvette 350 engine. If you don't have the manual, you can often find a digital copy online.
If you're unsure, consult a qualified mechanic. They can assess the condition of your engine and recommend the best viscosity for your specific situation. Using the wrong viscosity can damage your engine.
