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Old 06-05-2010, 04:28 PM   #1 (permalink)
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2007 MDX Rear Diff & Tranny Fluid Flush Frequency

Hello,

I've done some Google searching, and can't seem to find the answer. My searches did enable me to find this website, and I searched here as well, but I haven't been able to find it.

I have a question regarding the recommended frequency for changing the rear differential and transmission fluids. I don't know a whole heck of a lot about cars with respect to maintenance, so I'm a little lost.

My wife has a 2007 MDX. The rear diff service was done at 26740 (12/19/08). It was then done again at 39,869 on 12/5/09. The first transmission service was also done on 12/5/09.

Today, she had an appointment for an oil change and an unrelated TSB for an faulty oil pressure sensor, and they recommended a rear diff and transmission service. Forgetting that she had done these 6 months ago, she OK'd it. When she got home, she was pissed because it was $300+ for something that was done 6,000 miles ago.

She called the dealer back, and spoke with the Service Manager who thought it was a little odd that the mechanics recommended those two services again today. He suggested that she might be burning the fluid, which he said "meant something is wrong with the transmission." I find that a little hard to believe.

So, I'm taking a more active role in her car's maintenance. This MDX is owned and paid for for a year and a half now, so we'd like it to last as long as possible.

I've read some things on the Internet about tranny problems, but her car is rock solid. I'd rather not have to pay for unncessary fluid changes long before they are actually due.

Recommendations, feedback all welcome. Thank you.
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Old 06-05-2010, 09:25 PM   #2 (permalink)
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The only items that need to be done for maintenance are shown on the MID, the code for these items are shown in the owners manual
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Old 06-05-2010, 11:58 PM   #3 (permalink)
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You paid $300 for $30 in fluid and 30 minutes of work? Time to DIY that stuff. IMO
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Old 06-07-2010, 09:49 PM   #4 (permalink)
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Originally Posted by ductman View Post
The only items that need to be done for maintenance are shown on the MID, the code for these items are shown in the owners manual
I believe it was showing B1, so I'll have to check in on that. I suppose if MID called for that 6 months after it was done last, there might be a problem there.
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Old 06-07-2010, 09:50 PM   #5 (permalink)
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You paid $300 for $30 in fluid and 30 minutes of work? Time to DIY that stuff. IMO
Nah, you didn't read my post above. Cars aren't my strong point. You have to know what you don't know, ask questions, and trust others.

If you want to ask me or my wife any Pharmacy questions, as Pharmacists, we'll be glad to help you. We're not car mechanics, yet we trust and like Acura. Just looking to see why the fluid was recommended/required so frequently, that's all.

My free time is limited, so $300 for this service, if needed, is well worth it.
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Old 06-08-2010, 01:10 PM   #6 (permalink)
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The dealer screwed up and is charging you for it. You could probably complain to your state;s Motor Vehicle Department- they are usually very attuned to over-service by dealers. But if you do complain, you'll have to find another dealer. If you go back, you'll wind up with sugar in your gas tank.
I'm more interested in the TSB for the oil pressure sensor. Will you please copy the TSB number from your invoice, and post it? Thanks
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Old 06-09-2010, 11:23 AM   #7 (permalink)
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Sounds fishy. You can't' burn transmission fluid. It can leak, but that would probably be obvious. Also, it would be highly unlikely that you would leak fluid from both the transmission and the rear differential. My guess is the someone pushed a high profit service before checking your service history. I would speak to someone at the dealership and let them know your concerns.
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