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What is the oil capacity of a 1979 jeep 4.2 inline 6?

The oil capacity of a 1979 Jeep 4.2L inline-6 engine is approximately 5 quarts. However, it's always best to check your owner's manual for the exact specification, as there might be slight variations. Adding a little extra (up to a half-quart) won't hurt, but overfilling can be damaging.