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Guys, This is my 4th new Honda (one of them I drove 350,000 miles), my 4th AWD/4WD car, I have driven over 1 million miles without hitting anyone else, I have built several homes and did every part of them (I only knew 1 other person who could do that), have overhauled many engines and am known as “the person who can fix just about anything” but have never needed to change differential fluid, and needing to that does not make sense to me. I know very well the difference between a differential and a transmission. One of my best friends is a certified Honda mechanic. And every other brand too (including Porsche, Mercedes and BMW..I have seen his certificates). I wrote to Honda America, and they told me that they don’t answer technical questions and to ask my "idiot" dealer. I am here to learn what Honda may not have told us. This brings up 2 questions….does anyone know if the rear differential is always “active”? Something tells me it is not….When I bought my HR-V,, the dealer only gave me 2 books…a 150 page owners manual and a much smaller customer information book. It sounds like each dealer is different?
This differential is different from the old differentials you are accustomed to. They work like automatic transmissions. Do you know the difference between a four wheel drive and an all wheel drive?
 

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Just finished changing the differential fluid, very easy. Make sure that you can loosen the top fill bolt first before taking out the drain plug (the one with the magnet). I drove the rear of the HRV onto a set of ramps to give me room underneath. Drained the fluid, change the washer, tighten to 35 ft lb. Remove the fill plug. I used a bottle pump to put the fluid back in. Much better than the long hose I used to use on my 97 CRV. The pump allows you to just pump in what is needed and stop when the fluid comes out the fill plug. Takes no more than 30 mins and less than $20.00 for fluid and two crush washers

Here is a link to the pump, $12 for two pumps. https://www.amazon.com/gp/product/B01LDMXNSO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

31636
 

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I have a 2018 HR-V AWD with 22,500 miles. Recently took it to the dealership to have them check the right rear suspension and they mentioned that it needed a differential service at 15K miles which they have no record of doing. Would that service have been billable or would it have been covered at the time? If it is billable, how much does it usually cost?
 

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I have a 2018 HR-V AWD with 22,500 miles. Recently took it to the dealership to have them check the right rear suspension and they mentioned that it needed a differential service at 15K miles which they have no record of doing. Would that service have been billable or would it have been covered at the time? If it is billable, how much does it usually cost?
I don't think its a free service - unless you bought some sort of maintenance plan from the dealer before hand or something like that. I should not be too expensive as there is very little fluid, only 2 small crush washers to replace, and once up on a lift- its probably under an hour of labor. I hav no idea what " the dealerships' are charging.
 

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Replacing the rear differential fluid is a maintenance item, so it would have been billable.

Get it done. The first change is recommended at 15,000 miles, then every 30,000 miles after that.

+++++++++++++

Yeah, it doesn't take long to do yourself: drain & fill, pump in 1.3 qts of new Dual Pump Fluid. Should be less than an hours' labor at a shop.
 
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Because of my driving conditions, I change it in my Honda HR-V, CR-V and Element at 15K mile intervals. It's only 1.5 quarts to refill, not expensive and easy to do in the taller vehicles.
The Element goes to the shop for this because my rolling floor jack won't fit underneath the rear nor will it fit underneath the side steps which are nice, but in the way. I'm too lazy to use the spare tire jack. Can you tell I like Honda AWD vehicles? My other cars are also Honda, but FWD.
 

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There is lots going on in inside the HRV rear differential:
The standard ring and pinion, the wet clutch, stepper motor to control the clutch and the input (the driveshaft) is constantly turning even when AWD is not active.

Plus there is no fluid filter, plus no cooler, plus the very small volume of differential fluid.

All that adds up to the short 15k mile fluid change intervals.
 
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My 1999 CR-V rear diff took Honda Dual Pump II fluid, the same that I used in my recent CR-V and Element. The old owner's manual called for rear diff fluid changes @ 60K miles, but the service manager recommended 30K mile changes unless the driving conditions were severe and then he suggested shorter intervals. I've used 15K intervals.

Note that the Pilot uses a different system to drive the rear diff which does NOT have dual pumps. I don't know which fluid it takes but I do know that it is electronic instead of mechanical/hydraulic.
 

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The first MM alert comes about 15K miles to change out the "break-in" oil. The interval for subsequent changes is longer. I'm at 37K miles and haven't gotten it yet. I'm at 90% for the next service which should be about 42K miles and it's still not showing up.
 

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Changing the rear diff fluid in any Honda AWD Dual Pump system (excludes the Pilot) is probably the cheapest and easiest maintenance job there is on these vehicles. I can't believe all the took about how long you should go between fluid changes. This is a sophisticated system and the only thing you have to do is replace 1.5 quarts of fluid. Even if you pay someone else to do it, you probably only have to do it at most, is once a year. I'll bet a lot of people pay more on Starbucks in that time.
 

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I just had my 15,000 "break in" done, it was $150. You'll know when it needs to be done, the MM will show a "6".

 
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