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For a 2003 Chevy S-10 truck with a 4.3L V6 engine, it should use a synthetic blend 5W-30 motor oil and hold about 4.5 US quarts with the filter. This truck will require an oil change every 5,000 to 7,500 miles. Its oil capacity is smaller than many other trucks, so if you do it yourself, expect to spend $20 to $30 on oil. If you opt for a professional oil change, the cost will be around $100 to $130.
The oil used in this car is a high mileage full synthetic type, with a viscosity grade of 5W-30.