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In 2002, the Jeep Wrangler with a 2.5L i-4 engine holds 4 quarts of oil, while the 4.0L I-6 engine requires 6 quarts according to the manufacturer's specifications. The recommended oil for this vehicle is SAE 10w-30 full synthetic. It is essential to change the engine oil and filter every 3000 - 5000 miles to maintain peak performance. Failing to do so can lead to oil losing its viscosity and failing to adequately lubricate vital engine components like pistons and cylinders. Prices for oil typically range from $5 to $10 per quart, depending on whether it is conventional or synthetic and its brand/quality. Remember to replace the oil filter when changing the oil. The oil change is a crucial service interval that should not be neglected, which is why the oil light in the vehicle serves as a reminder.
Avoid using synthetic oil for the inline six engine as it requires conventional oil to prevent engine failure.
The 2002 Jeep Wrangler with the 2.5L 4-cylinder engine requires 4 quarts of synthetic 10W30 oil, whereas the 4.0L 6-cylinder engine version needs 6 quarts of the same synthetic 10W30 oil.