Discussion
Which lubricant does a front hub with taper roller bearings use?
Answer: D
The heat from braking demands a grease with a high drop point, and ordinary chassis grease melts and runs out. Overpacking is also avoided because the excess churns and overheats. Oil lubrication is used on heavy vehicle hubs but not on cars. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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