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Discussion Starter #1 (Edited)
I sent in a sample of my ATF on my truck from my last drain and fill. I bought the truck with 41,XXX miles. The Honda dealer I bought it at did a drain and fill before I bought it. I did one at 45,000 and then did 2 more at 60,000. Then I just did this one at 75,000. I always get out exactly 4qts every time. Anyhow here's my UOA. I was looking to get a baseline if there was any coolant present and I'll do another sample when I drain it again at 90,000 and see if there is any change.

(If it's not really readable let me know. I uploaded it from my iPhone. I can upload it again from Mac laptop.)

View attachment 199825


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2006 Ridgeline RTS in Steel Blue
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Your numbers look similar to mine, now that I can read it....:act035:

Here is my UOA from LabOne...

Only one mistake on it, the most recent should state sampled, the one before should state changed on the fluid status.
 

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Discussion Starter #3

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Ok I attached the PDF from my computer to the first post. I forgot to do it last night when I got home from work
 

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Thanks to both of you for posting up the ATF UOAs!

Note the Zinc. Honda uses a bunch, relatively speaking, in their ATF. Honda's ATF is not suitable for other automatic transmissions, due to the quantity of zinc. However, the other way around is not automatically true.

Note also the Barium marker.
 

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My intention is to do. D n F with each oil change & try to keep the numbers the same. If that doesn't work I'll do another 3-5 D n F's
 

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Discussion Starter #7
Yeah I'm going to do a UOA with each D+F from now on. My next will be at 90,000 and then my next one at 105,000. See if any coolant is present.

I'm hoping the problem is fixed on the 09 and up models, since they did switch the part numbers.


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I sent in a sample of my ATF on my truck from my last drain and fill. I bought the truck with 41,XXX miles. The Honda dealer I bought it at did a drain and fill before I bought it. I did one at 45,000 and then did 2 more at 60,000. Then I just did this one at 75,000. I always get out exactly 4qts every time. Anyhow here's my UOA. I was looking to get a baseline if there was any coolant present and I'll do another sample when I drain it again at 90,000 and see if there is any change.
Aren't there shops that will do a 'flush' of the trans fluid? I'm new to Ridgeline but always had my GM products flushed since you couldn't get the bulk of the fluid changed due to the torque converter.
 

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Find a competent trans shop or other independent mechanic. But tell them you want a fluid exchange, NOT a flush or power flush. If they don't, or don't know what you mean, walk.
 

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Aren't there shops that will do a 'flush' of the trans fluid? I'm new to Ridgeline but always had my GM products flushed since you couldn't get the bulk of the fluid changed due to the torque converter.
This is the official Honda perspective on tranny flushes:



 

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Not Yet, that is my plan when I send in my next samples
 

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Here is the full report for OhSix...


Lab One Inc Good to work with...
 

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I feel like a hypochondriac at a doctor's convention when I read these threads. My maintenance minder tells me when to change tranny fluid and I do it with whatever the Honda dealer sells as transmission fluid. At 165,000 my transmission shifts fine, like the day I bought the truck.

Now for those of us going by mileage, the chart to follow says to change every 30,000 miles. A change is a drain and fill ~4 quarts. The old and new transmission fluids are upward compatible, you drain the old and fill with whatever Honda is selling as the new. No talk of having to do a 4x change, except on these forums or in the MM if something unusual has happened to require a flush. A routine fluid change is not a flush.

My Passat AWD had no schedule for trans fluid change at all, but I changed it at 160,000, now has 225,000. Shifts fine.

Discussions on Ridgeline transmission fluid changes remind me of Lady Macbeth's obsession with spots. An obsession.
 

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I feel like a hypochondriac at a doctor's convention when I read these threads. My maintenance minder tells me when to change tranny fluid and I do it with whatever the Honda dealer sells as transmission fluid. At 165,000 my transmission shifts fine, like the day I bought the truck.

Now for those of us going by mileage, the chart to follow says to change every 30,000 miles. A change is a drain and fill ~4 quarts. The old and new transmission fluids are upward compatible, you drain the old and fill with whatever Honda is selling as the new. No talk of having to do a 4x change, except on these forums or in the MM if something unusual has happened to require a flush. A routine fluid change is not a flush.

My Passat AWD had no schedule for trans fluid change at all, but I changed it at 160,000, now has 225,000. Shifts fine.

Discussions on Ridgeline transmission fluid changes remind me of Lady Macbeth's obsession with spots. An obsession.
Some and I'd include myself in the group noted that when the change from Z-1 to DW-1 which was a change from semi-synthetic to full synthetic "felt" a noticeable change in shifting. I only did this to flush the "coolant" from the ATF and would have stuck with the 30k interval, which may have been a partly due to the fact that Type 2 Coolant was polluting the transmission for my specific instance.

As for the UOA thread, I believe it's important as a method to identify a $75-$150 part (radiator) which will ruin a $3500 and up part (transmission)
 

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I did a fluid exchange on mine around 30K. I figure from now on I will do 1X every 15K or so. I like the idea of doing a UOA after 50K with each change to be sure there are no traces of coolant.
I am not saying don't change the rad until you see a trace of coolant in the fluid, but until you hit 100K you may avoid being a statistic or the 'exception' to the rule.
 

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I feel like a hypochondriac at a doctor's convention when I read these threads. My maintenance minder tells me when to change tranny fluid and I do it with whatever the Honda dealer sells as transmission fluid. At 165,000 my transmission shifts fine, like the day I bought the truck.

Now for those of us going by mileage, the chart to follow says to change every 30,000 miles. A change is a drain and fill ~4 quarts. The old and new transmission fluids are upward compatible, you drain the old and fill with whatever Honda is selling as the new. No talk of having to do a 4x change, except on these forums or in the MM if something unusual has happened to require a flush. A routine fluid change is not a flush.

My Passat AWD had no schedule for trans fluid change at all, but I changed it at 160,000, now has 225,000. Shifts fine.

Discussions on Ridgeline transmission fluid changes remind me of Lady Macbeth's obsession with spots. An obsession.
Its spectacular that you and so many others have experienced excellent service life with the original radiator! That's what every owner tries to achieve by following the maintenance schedule. On the flip side of that, a certain % of owners driving vehicles of similar design haven't been nearly as fortunate.

As was mentioned by other forum members, this thread is about keeping tabs on a potentially catastrophic failure - which can occur at any time regardless of calendar age, miles on the ODO - or even - visual inspection.

With no traditional, reliable method to gauge a potential failure, owners are left with precious few solutions. UOA is the only "real" method to know what's happening inside the trans.
 

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I sent in a sample of my ATF on my truck from my last drain and fill. I bought the truck with 41,XXX miles. The Honda dealer I bought it at did a drain and fill before I bought it. I did one at 45,000 and then did 2 more at 60,000. Then I just did this one at 75,000. I always get out exactly 4qts every time. Anyhow here's my UOA. I was looking to get a baseline if there was any coolant present and I'll do another sample when I drain it again at 90,000 and see if there is any change.

(If it's not really readable let me know. I uploaded it from my iPhone. I can upload it again from Mac laptop.)

Sent from AutoGuide.com Free App
Wow, pretty slick. Nice that the lab interprets the results for you too vs just sending you a bunch of numbers on a report. What's the cost per sample to have them do this report and does your dealer handle this for you?

Another question comes to mind. I'm surprised at the means of changing transmission oil I've seen going on here given some shops can do a total flush and renew ALL the trans fluid. As a matter of fact, a local transmission shop I approached about changing my oil and filter recommended that I go to one of these shops to get a total fluid change. This was with another vehicle however that didn't require quite so specific of trans fluid as the Ridgeline does but my question - have any owners tried that approach versus just getting the minimum changed at a dealer?
 
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