Dex VI - when to change?

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stockrex

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My duramax diesel has an Alison 1000 with Dex VI from factory (guessing).
It was made in 10/2007 and it was 17k miles on it today.
the fluid is over 11 years old, should I go ahead and drain and fill it?
I have some transynd in my stash.
 
prolly yes for peace of mind at least as age plays into lubricant degradation as does miles. my 2011 frontier SV i recently purchased had only 20 thou on it, but ALL the fluids were replaced + upgraded where available with Redline products. the stuff coming out looked poor + knowing OE fluids are at times on the cheaper side i feel my free labor + about 200 cost was a good move + i noticed better MPG's for it!!
 
Originally Posted by atikovi
Who buys a $50,000+ truck and only drives it 1,400 miles a year? You just buy it? Unless it was a government vehicle, I'd be suspicious of the mileage.


Who you ask, some "idiot" named stockrex, I bought it new with 200 miles on it and lots of plans, but few years after that the ex ran away with her boyfriend and tried to take the children with her. Hence the lack of miles, my focus has been on other stuff lately.
 
Originally Posted by stockrex
Originally Posted by atikovi
Who buys a $50,000+ truck and only drives it 1,400 miles a year? You just buy it? Unless it was a government vehicle, I'd be suspicious of the mileage.


.. the ex ran away with her boyfriend and tried to take the children with her. Hence the lack of miles, my focus has been on other stuff lately.



Sorry for your misfortune man.
 
Originally Posted by stockrex
Originally Posted by atikovi
Who buys a $50,000+ truck and only drives it 1,400 miles a year? You just buy it? Unless it was a government vehicle, I'd be suspicious of the mileage.


Who you ask, some "idiot" named stockrex, I bought it new with 200 miles on it and lots of plans, but few years after that the ex ran away with her boyfriend and tried to take the children with her. Hence the lack of miles, my focus has been on other stuff lately.



Well that sucks. At least with only 17K, it's got a high book value. I'd also change the coolant which should be done every 5 years.
 
Use the Transynd or any TES-295 approved ATF! I probably have one of the highest mileage Allison 1000's on this board at 420,000 miles & have ran TES-295 since 60,000.
 
Last edited:
Originally Posted by clinebarger
Use the Transynd or any TES-295 approved ATF! I probably have one of the highest mileage Allison 1000's on this board at 420,000 miles & have ran TES-295 since 60,000.

What year and how many hours on the truck? 5 or 6 speed Allison? How often do you do a drain/fill and/or spin-on filter change?
 
Originally Posted by BlakeB
Originally Posted by clinebarger
Use the Transynd or any TES-295 approved ATF! I probably have one of the highest mileage Allison 1000's on this board at 420,000 miles & have ran TES-295 since 60,000.

What year and how many hours on the truck? 5 or 6 speed Allison? How often do you do a drain/fill and/or spin-on filter change?


2006, 6-Speed, My hour meter has reset several times (A known issue with GMT800 pick-ups). I usually drain & fill every 60K-90K.

I'm very sporadic about the spin-on/control main filter, The only time I ever had any ferrous metal on the magnet was the first service. If the truck makes it another 100K.....I'll change it!!
 
Cline - that is a lot of miles, :-), let's see if I can put in 20k this year, I plan to fish the East side and some in Canada. Thanks for sharing your service regime.

Smoke, C'est la vie, my children always come first so I have no regets, if they are happy, I am happy :-)
Atik - yeah tell me about it, I had to pay her half in cash for that "HIGH" book value, as someone who had never been in debt, debt was my middle name and I had to sell some plasma and my right kidney.

Back on topic:

Radiator - done 2x already, though know I have leak, I need to change the oring at the end of the hose.
Brake - this is pending - I am going to vac out the system and in spring take it to stealership for the abs module flush, I think you need the tech2000 tool to correctly flush it.
Rear Diffy - Done last year, made a HUGE difference, my butt dyno clocked 5 hp extra min
Transfer case - I need to do this , dealer had rebuilt this under warranty, I need to get a new drain pan to capture the drained fluid to check for metal.
Front diffy - Next on my list after it gets above 50F
Frame rust - I need to treat the frame rust in some spot from driving in salt and snow the year I bought it.

Transmission - I am going to drain and fill it any day we have above freezing temps, Do I need to warm up the trans first?
 
I think it's the same as my truck so you could just do exchanges it's pretty simple. You just pop off the transmission cooler return pipe at the radiator. Turn on the engine pump out 3 quarts. Put three quarts back in and do it again. 4 times in a row you'll get it all. Then after that if you want to swap the filter which I don't think is necessary you could do it. Then you're putting the filter into a clean environment. You're not doing a pan drop and putting a filter into dirty oil. Pan drops only getting 33%
 
Also I saw on the list you may have rust poking through the GM frame wax. What you want to do is scrape away the wax around the rust spot. Give it a good clean with a wire wheel some grinding or a little sandpaper. Then cover it up with corroseal. And cover with NOX-RUST X-121B from Daubert. It's the factory wax in a can
 
Originally Posted by clinebarger
Is your truck a GMT800 or a GMT900 platform? Both were made & sold as 2007 model year trucks.

Cline, It is a GMT900 platform
 
Originally Posted by LeakySeals
You're not doing a pan drop and putting a filter into dirty oil. Pan drops only getting 33%

LeakySeals, The alison trans has a drain plug and an external spin on filter,
Drain and fill is 7.4 quarts and total is 12.7 quarts.

Drain and fill this time with Castrol Transynd will yield 58% new syn fluid, at the end of the year, I will probably do another drain and fill at 40k miles that should get to > 80% all new fluid [did I get the math right?]
 
Originally Posted by LeakySeals
Also I saw on the list you may have rust poking through the GM frame wax. What you want to do is scrape away the wax around the rust spot. Give it a good clean with a wire wheel some grinding or a little sandpaper. Then cover it up with corroseal. And cover with NOX-RUST X-121B from Daubert. It's the factory wax in a can


So that is what the peeling stuff is, good info, I thought it was some sorta paint peeling.

[Linked Image]


[Linked Image]


Clean brush sand > reapply corroseal

I have the stuff peeling big time under the doors, scrape off with a putty knife?
 
Originally Posted by stockrex
Who you ask, some "idiot" named stockrex, I bought it new with 200 miles on it and lots of plans, but few years after that the ex ran away with her boyfriend and tried to take the children with her. Hence the lack of miles, my focus has been on other stuff lately.

On the positive side, that's probably one of the few diesel trucks of that vintage without half a million miles on it, aside from those owned by retirees.
wink.gif
 
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