Correct answer
Gear oil with the specification, viscosity and additives approved for each unit.
Use gear oil of the specification approved for each unit, commonly called valvulina in Spanish. Viscosity and additives, including extreme-pressure additives where required, must match manufacturer instructions. Choosing the thickest oil is insufficient, and engine oil is not an automatic substitute. The gearbox and differential may require different lubricants.
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Any engine oil, without checking compatibility.
The highest-viscosity oil available, regardless of specification.
Gear oil with the specification, viscosity and additives approved for each unit.
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