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Type oil for 1990 Chevy c1500 with a 305 motor?

The recommended oil type for a 1990 Chevy C1500 with a 305 engine depends on several factors, including your location and driving conditions. However, a good starting point is to consult your owner's manual. That manual will specify the recommended viscosity (like 10W-30, 10W-40, etc.) and oil type (conventional, synthetic blend, or full synthetic).

If you don't have the owner's manual, a common recommendation for a 305 engine in that era is 10W-30 conventional oil. However, 10W-40 is also acceptable, especially in hotter climates or with higher mileage. Always check your owner's manual for the most accurate information.

Before changing your oil, be sure to check the owner's manual for the correct amount of oil required for your specific engine. Using too much or too little oil can damage your engine.