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hey guys first post on the forum

just bought a 02 crew cab D/A had 168,700 on it when i picked it up in houson drove it back to michigan now has 170k, ran great the trip home but know i am ready to start pulling my 5th wheel but want to change the tranny fluid and filter and the engine oil and filter. no manual.
i need to know the capacities and in general any thing special that needs to be done, i have already purchased a new fuel filter but couldn't seem to unscrew the white plastic thing out of the one that is there nor could i unscrew the filter with my hands??

any help would be appreciated. i must say this duramax runs way better than my 6.2 of course the 6.2 has 278,000 on it.
 

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weight

also while i am at it what weight oil should i put in for Michigan
the sticker on the windshield from texas says it has BMS5w40 right now

i assume that is Bulk Mobile Synthetic 5w 40?
 

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Im not shure on what you should run in the duramaxs but in my cummins I run Rotella 15-40 and it runs great I know that my tranny fluid is a different type then yours tho, with that much milage you might want to consider a tranny flush because even when you drain the tranny there is still like 6 quarts of old fluid still in there a flush flushs new fluid through every thing

Someone else will reply to this message this morning also Im shure :woot
 

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I am kinda biased, but I run Amsoil in my Cummins and I have several customers with Amsoil in their Dmax's. 15w-40 is my recommendation.
Info is here.

Amsoil actually has an oil designed specifically for the Allison auto.
Info is here.

Engine - 10 quarts
Transmission - 7.5 quarts with standard pan, 13 quarts if you drain the converter and cooler and everything.

Got the info here.
 

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Stop by your local Chevy/GMC dealership and have the AT serviced. You can't do it yourself as well as they. Chevy dealership installs 15W40 diesel oil. The fuel filter must be loosened with a filter wrench, then you can remove it with your hands. Be sure to unplug the electric wiring plug first! Drain the filter before attempting to remove it or you'll create a mess under the hood. After you have removed the filter you can use a large wrench, or carefully use channel-locks, and the filter wrench again to remove the water sensor. Fill the new filter with clean fuel before installing it. Oil all gaskets and O-rings before installing.
 

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I change my transmission fluid every 10-20k and at 90k took the pan off to change the internal one finding it to be sparkling clean inside. it usually takes about 2 gallions of atf. If you do it about every 5k for 2 or three times it will clean up your system for you. and i recomend putting lucas trans additive it renews the lube quality of your fluid you can not change available at napa. the dealer does not do any better job just charges more to do the same. you probably do want to do a trans service to change the internal filter with the milage you got. also when i changed my water pump we found some junk on the inlet side of the radiator where the trans lines connect and had to clean it up. I expected to find more in the pan but did not still have not figured out what it was but it was causing a restriction to the cooler.
 

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internal filter

whoa wait a minute you mean to tell me there is an internal tranny filter as well as the spin on?
 

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yes there is a filter in the pan just like any other automatic transmission and when regular maintaince has not been taken care of both should be changed
 

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Yup. The internal is kind of a last chance to stop anything from going in the valve body, but the spin on does a really good job as long as it is changed regularly. If not, then the filter can clog and go into by pass mode where unfiltered oil enters the pan and now the only filter is the internal.

I recommend AGAINST using Lucas Oil ATF additive. I have seen too many trucks come through here with the motor oil additive and the warm motor oil comes out like cold gear oil. Not good. Additives don't fix anything. If the oil is wore out it needs replacement. There is more to oil than just viscosity. This is why we use the Amsoil. It is rated for a lifespan of 100k miles or more. It won't wear out or thicken up, or burn for that fact.
 
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