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What type of oil does a 91 Jeep Wrangler?

The type of oil a 1991 Jeep Wrangler needs depends on the engine it has. There were several engine options for that year. To know for sure, you need to check your owner's manual or the sticker under the hood.

However, generally speaking, a 1991 Jeep Wrangler would likely use either SAE 10W-30 or SAE 20W-40 motor oil. The specific recommendation will be based on the engine's specifications and the climate where you live. The owner's manual will specify the correct viscosity and whether it should be conventional, semi-synthetic, or full synthetic. Using the incorrect oil can damage the engine.