Honda B16 service: what’s included
A Honda B16 service is the B service plus items 1 and 6: change the engine oil and oil filter, inspect the car, rotate the tires, and replace the rear differential fluid. Item 6 exists only on all-wheel-drive Hondas, so a front-wheel-drive Honda never shows B16.
On this page (7 sections)
What a B16 service includes
| Part of the code | Job |
|---|---|
| B | Engine oil and oil filter |
| B | Check of the front and rear brakes, steering and suspension parts, driveshaft boots, brake lines, exhaust, fuel lines, and every fluid |
| 1 | Tire rotation |
| 6 | New rear differential fluid (all-wheel-drive models) |
From the 2022 Pilot and 2022 CR-V Maintenance Minder pages, where item 6 is marked “not available on all models.” Your owner’s manual shows whether your car has it.
Item 6: the rear differential fluid
On an all-wheel-drive Honda, the rear differential is the gear unit between the rear wheels. It splits power between them so they can turn at different speeds in a corner. It has its own oil, separate from the engine oil and the transmission fluid. That oil is what item 6 replaces.
Three checks for the shop:
- The right fluid. Honda all-wheel-drive systems use the fluid named in the owner’s manual. A general gear oil is not a substitute unless your manual allows it.
- Drain and fill. The job drains the old fluid from the differential and refills it to the correct level. Ask how much went in.
- Not the same as item 3. On some models, such as the 2022 Pilot, the transfer fluid (the gear unit that sends power to the rear) is under item 3 with the transmission fluid, not under item 6.
Front-wheel-drive models, such as the 2022 Odyssey, have no item 6 in their list at all.
More on what this fluid does and how often other carmakers change it: differential fluid.
Towing and mountain driving
The Maintenance Minder does not know how hard the rear differential works. The 2022 Pilot manual says that slow driving in the mountains and trailer towing put more stress on the fluid. If you drive like that regularly, Honda says to change the differential fluid at 7,500 miles, then every 15,000 miles, even if item 6 has not appeared.
If you tow a camper every summer, write down the miles towed. It helps you and the shop decide when the fluid is due.
How much a B16 service costs
There is no set price. A B16 costs about what a B1 costs at the same shop, plus the differential fluid and its labor. As a rough guide, an oil and filter change runs about $64 to $118 (AAA shop survey, scaled to late 2026) and a tire rotation about $45 to $75 (Consumer Reports), so the B1 part comes to about $109 to $193. We couldn’t verify a national price for a differential fluid change, so ask for that line on its own, with the fluid named and the amount.
More on the B1 part: oil change cost and tire rotation.
What to write down
- Date, odometer, and the code (B16)
- Differential fluid name and amount
- Oil grade, amount, and filter part number
- Rotation done, what the inspection found, and the price
- If you tow: about how many miles you towed since the last change
Item 6 comes around rarely, so the last date is easy to lose. Keep it in your car maintenance log. Every code is on the Honda maintenance codes chart.
FAQ
What does B16 mean on a Honda?
The B service (new oil and oil filter, plus an inspection), a tire rotation (1), and new rear differential fluid (6). Only all-wheel-drive models have item 6.
Why doesn’t my Honda ever show item 6?
Most likely it is front-wheel drive. Item 6 is for the rear differential, which only all-wheel-drive models have. The maintenance list in your owner’s manual shows which items apply.
How much does a Honda B16 service cost?
About the price of a B1 at the same shop (roughly $109 to $193 at typical published prices) plus the differential fluid and labor. Get a written estimate that names the fluid.
Milealot is an independent site, not affiliated with or endorsed by American Honda Motor Co. Honda and Maintenance Minder are trademarks of their owner and are used here only to name the system.
Sources
- Honda, 2022 Pilot owner’s manual, Maintenance Minder pages (item 6 on some models; differential fluid at 7,500 miles, then every 15,000 miles for mountain driving or towing; transfer fluid under item 3) (checked November 12, 2026): owners.honda.com
- Honda, 2022 CR-V owner’s manual, Maintenance Minder pages (B list, item 6 not on all models) (checked November 12, 2026): owners.honda.com
- Honda, 2022 Odyssey owner’s manual, Maintenance Minder pages (front-wheel drive: no item 6) (checked November 12, 2026): owners.honda.com
- AAA, Synthetic vs. conventional engine oil, research report, 2017 (shop survey: typical oil change $38 conventional, $70 synthetic): ace.aaa.com
- U.S. Bureau of Labor Statistics, CPI for all urban consumers, motor vehicle maintenance and servicing (series CUUR0000SETD; June 2017 to October 2026, about +69%) (checked November 12, 2026): data.bls.gov
- Consumer Reports, Your car maintenance checklist (tire rotation about $45–$75; updated May 6, 2026; checked November 12, 2026): consumerreports.org