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What oil do you use in a 1989 Ford Tempo?

The recommended oil for a 1989 Ford Tempo depends on the engine it has. Ford Tempos of that year came with either a 2.3L four-cylinder or a 2.3L turbocharged four-cylinder. The owner's manual is the definitive source, but generally:

* For both engines: The oil should meet API service classification SE or SF. These are older classifications; modern oils exceeding these are generally fine.

* Viscosity: The viscosity grade will depend on the climate. Look in your owner's manual, but a common range would be 10W-30 or 5W-30. For very cold climates, 5W-30 might be better. For very hot climates, 10W-40 might be considered, but always check the manual first.

It's crucial to check your owner's manual for the specific recommendations. The manual will provide the exact oil type and viscosity recommended by Ford for your particular engine and operating conditions. Using the wrong oil can damage your engine.