> I'm aware. When I asked "Transmission? Do you mean the reduction gear?" the service manager was confused and started stammering when I asked why all of them need off schedule service.

Page 19, reduction gear oil should be "inspected" every 15,000 miles or 12 months. Unsure what kind of inspection they'd do, but annual replacement seems like overkill (unless Nissan cheaped out on the fluid and/or cooling).

There's two schedules based on driving habits in the owner's manual. IIRCC the earliest scheduled change is at 90k.

Look at page 19 (well, page 16 actually). The 30,000 mile service (page 19) is the same for both schedules, the 15,000 mile service (page 16) is different but for both schedule 1 (severe) and schedule 2 (normal) "reduction gear oil" is listed. 15,000 miles is a lot less than 90,000 miles.

In the end, the service writer was probably sputtering because he didn't know how to argue with alternative facts.