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What oil does a 1990 Jeep Wrangler need?

A 1990 Jeep Wrangler requires SAE 10W-30 motor oil unless extreme temperature conditions dictate otherwise. Always check your owner's manual for the most accurate and up-to-date recommendation for your specific engine (4.2L straight-6 or 2.5L 4-cylinder were common in 1990). The manual may specify a certain type of oil (conventional, synthetic blend, or full synthetic) as well. Using the wrong oil can damage your engine.