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Replace oil in the gearbox and differential gears.
OR
Replace oil in the gearbox and in differential gears.
?

Comments  

The sentences are unnatural.

282warrantReplace oil in the gearbox and differential gears.

"Replace the oil in the gearbox and differential." This is fine.

282warrantReplace oil in the gearbox and in differential gears.

"Replace the oil in the gearbox and in the differential." This is also fine, but it is much less likely. You might put it this way to emphasize that you also want the oil changed in the differential.

Thank you! I exactly wanted the oil to be changed in the differential gears too.

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282warrant

Thank you! I exactly wanted the oil to be changed in the differential gears too.

Right, but what I meant was that the first sentence gets that done just fine.