Correct answer
Viscosity and properties suited to the loads and temperatures, following the manufacturer’s specification.
Suitable viscosity and properties to maintain lubrication, reduce friction and protect against wear under the expected loads and temperatures, according to the manufacturer’s specification. Choosing the thickest oil is insufficient: transmissions may require different lubricants, and the oil must be approved for the specific unit. Low temperatures matter too because they affect fluidity. Strong acidifying properties are not a desirable gear-protection feature.
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Viscosity and properties suited to the loads and temperatures, following the manufacturer’s specification.
The highest possible viscosity for every gearbox, even if not approved.
Strong acidifying properties and protection only at high temperatures.
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