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Old 08-28-2013, 09:10 AM   #1
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Transmission oil change in TV

How often should transmission oil be changed in a TV?
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Old 08-28-2013, 10:46 AM   #2
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I have the tranny serviced every 20k- I use a synthetic oil- This is fewer miles than recommended but we have over 100k so far without any failures- Changing fluids is much cheaper than replacing parts- JMHO- DD
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How often should transmission oil be changed in a TV?
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Old 08-28-2013, 11:09 AM   #3
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owners manual is the best resource for that. they should have a few service schedules listed and trailer towing should be severe service schedule. myself , I tend to change it sooner rather than later pertaining to my owners manual as with these mountains around here the transmission gets a good workout. the 2011 expeditions I worked on here had sealed transmissions and the fluid was good for a long time under normal service. never looked at the severe service schedule.
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Old 08-28-2013, 01:23 PM   #4
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thanks for reply's, in the past my TV was always leased so i never had to worry about the transmission now that i own the expedition i will look in to following the schedule
thank again!!
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Old 08-28-2013, 02:51 PM   #5
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Generally its 50,000miles for severe use(pulling a trailer definitely counts), but I would agree that more often is better. I'd say every 20-25,000 at the most, that's my plan anyway.
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Old 08-28-2013, 04:13 PM   #6
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Just had ours (recently) flushed and changed at the dealership at 55k miles. We didn't and don't have any issues, but would think going by the severe service schedule makes sense to me as a plan.
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Old 08-28-2013, 11:53 PM   #7
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My truck is on the 30K schedule.
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Old 08-29-2013, 12:14 AM   #8
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Quote:
Originally Posted by clutch View Post
My truck is on the 30K schedule.
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Old 08-29-2013, 05:59 PM   #9
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In general, I recommend following your owners manual. However, the primary concern pertains to the transmission fluid temperature -- how hot has it gotten? Obviously, this will depend upon several factors such as the work load placed upon your TV (eg, towing a 30+ TT with a 1/2 ton TV will be working much harder than a 3/4 ton TV), the type of terrain, the ambient temperature; etc. As the temperature increases, the oxidation rate increases, thereby reducing the "life" of the transmission fluid. As you can see from the attached file, the oxidation rate doubles for each temperature increase of 20 degrees F above 175 degrees F.

[ATTACH][/ATTACH]

As just one example, let's assume that you're towing over a 10,000ft pass (having a 5-7% grade) where the ambient temperature is 90 degrees F. Knowing that you lose 3% horsepower (HP) of every 1000 ft above sea level, you immediately recognize that the TV has 30% less HP (meaning that the TV is going to be working extra hard). You clear the pass, but not after subjecting the transmission fluid to a range of 215-235 degrees F. Under these conditions, I would recommend changing the fluid in about 10K miles or less.

On the other hand, if you're towing under less extreme conditions, the normal temperature range will be between 175-185 degrees F, and I would change the fluid every 30K miles as suggested above.

So, the answer to your question of "how often?" is it all depends. It depends upon how you're using the TV. One thing I don't recommend is relying upon a service manager. Since most have good intentions of trying to save you some money by not performing unnecessary service work, they will answer your question by only looking at the mileage. Mileage, however, is very crude guide; knowing the transmission temp is better.
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Old 08-30-2013, 05:56 AM   #10
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25,000 miles here.
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