Discussion
Which lubricant does a hypoid final drive require?
Answer: D
The sliding along the tooth demands sulphur phosphorus additives that form a sacrificial layer on the steel surface. Without them the teeth scuff and fail rapidly. The same additives attack brass and must not be used in a synchromesh gearbox. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.
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