What weight of oil does a 1990 Nissan 300zx use?

A 1990 Nissan 300ZX typically requires 5W-30 or 10W-30 motor oil, depending on the climate and driving conditions. The engine oil capacity is approximately 5 quarts (or about 4.7 liters) when using an oil filter. Always check the owner's manual or consult a professional for the most accurate specifications for your specific vehicle.