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How many quarts of oil are required for an change on a 1990 Jeep Wrangler?

A 1990 Jeep Wrangler typically requires between 4 and 5 quarts of oil for an oil change. It's always best to check your owner's manual for the exact amount recommended for your specific engine. The slight variation depends on the engine size and whether or not you're also replacing the filter. Adding a little extra is generally okay, but overfilling can be harmful.