fluid change and fluid temps - Chevy and GMC Duramax Diesel Forum
07.5-10 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 18 (permalink) Old 10-08-2009, 11:14 AM Thread Starter
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fluid change and fluid temps

I got a 2009 dmax which has 8500 miles on it. I am just wondering how many miles i should put on before i change all of the fluids. Im not hard on the truck so i think it will be ok but would like to drain to get the shavings out.
Also wondering when everyone changes each.

Also wondering what temps everything should be at and when i let it warn up in the winter what temp should i wait for before i drive it.
Thanks
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post #2 of 18 (permalink) Old 10-08-2009, 11:18 AM
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fluids IMHO;

change everything as soon as you can.

engine 10qts 15-40 delo/amsoil/rotella
transmission; leave oem fluid, change red allison spin on filter and magnet
front diff; drain 2 qts, and replace with 2 qts 75-90wt
tcase; drain fluid, replace with 2 qts dex 6 transmission fluid (oem)
rear diff; drain fluid and replace with 75-90 wt diff fluid. I cannot remember how much it takes.



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post #3 of 18 (permalink) Old 10-08-2009, 11:22 AM
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Quote:
Originally Posted by Hondarider552 View Post
fluids IMHO;

change everything as soon as you can.

engine 10qts 15-40 delo/amsoil/rotella
transmission; leave oem fluid, change red allison spin on filter and magnet
front diff; drain 2 qts, and replace with 2 qts 75-90wt
tcase; drain fluid, replace with 2 qts dex 6 transmission fluid (oem)
rear diff; drain fluid and replace with 75-90 wt diff fluid. I cannot remember how much it takes.
Do the rears require any limited slip additive? IIRC they have a locking diff. Wasnt sure if it needed anything special.

And to the OP, I dont think it will get up to temp without a load on it....maybe eventually but I always hear diesels need a load

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post #4 of 18 (permalink) Old 10-08-2009, 11:26 AM
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Quote:
Originally Posted by BlkLT1Z28 View Post
Do the rears require any limited slip additive? IIRC they have a locking diff. Wasnt sure if it needed anything special.

And to the OP, I dont think it will get up to temp without a load on it....maybe eventually but I always hear diesels need a load
Rear's don't require any additive. Rear takes just under 4 qts

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post #5 of 18 (permalink) Old 10-08-2009, 02:16 PM
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Quote:
Originally Posted by midwest 09 dmax finally View Post
I got a 2009 dmax which has 8500 miles on it. I am just wondering how many miles i should put on before i change all of the fluids. Im not hard on the truck so i think it will be ok but would like to drain to get the shavings out.
Also wondering when everyone changes each.

Also wondering what temps everything should be at and when i let it warn up in the winter what temp should i wait for before i drive it.
Thanks
If I can send you some information about AMSOIL products for your Dmax, and save you 25-35% off retail prices, let me know.

Take care,
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post #6 of 18 (permalink) Old 10-08-2009, 07:29 PM Thread Starter
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Thanks for the replies about the fluids.
Wondering when you start up the truck when it is cold out how long and to what temp should you let everything warm up? im from minnesota so it will get down to 35 below
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post #7 of 18 (permalink) Old 10-08-2009, 07:48 PM
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You can get away with letting it warm up around five to ten minutes, but still take it easy because it takes a little while under load to really get warm. Also, with your mileage, I think you are ready to change the oil. The intervals after that depend on the oil you decide to run, but with AMSOIL you will be looking at up to 3X OEM intervals Warranted.

As for the others, change your transmission spinon filter around every 15-20K miles. The diffs take 4 quarts for the back and two for the front, and with AMSOIL Severe Gear 75w-90 you can go up to 50K miles under Severe Duty service and up to 100K under normal service as defined by your owners manual. You DO NOT need Diff Lock Additives, as a matter of fact I believe that GM also does not recommend additives in their diffs.

With the Transfer Case, they call for Tranny Fluid, you will be fine with whatever you decide to run in your tranny. There are some in the industry now however that have been running Synthetic 5w-30 engine oil in their transfer cases with positive results.

Grease the front chassis fittings at every regular service of your truck to make sure they stay good and greased, that is vital to the life of the bushings and joints.

Let us know if you have further questions!

God Bless

Chris
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post #8 of 18 (permalink) Old 11-25-2009, 11:18 PM
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I'm also getting ready to do my first service (around 7k) At this time I'm going to change the engine oil, filter, tranny filter, check all fluid levels, but will not change diff and trans case oil yet. (I've only towed my 5.5k trailer 500 miles and don't plan on towing again until the spring.) My question is how many fittings do I need to grease on the chassis/front end. should I use a gm product? What do you all suggest. Thanks.

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post #9 of 18 (permalink) Old 11-26-2009, 12:18 AM
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Being brand new, look at it this way. If you were to put a brand new motor in something the recommended intervals are 500, 1500 miles. Then regular intervals. Funny how buying a brand new motor you'll be told that, but by a brand new vehicle with a brand new motor in it and nothing's said about it.

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post #10 of 18 (permalink) Old 11-26-2009, 06:08 AM
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Quote:
Originally Posted by tierraman View Post
I'm also getting ready to do my first service (around 7k) At this time I'm going to change the engine oil, filter, tranny filter, check all fluid levels, but will not change diff and trans case oil yet. (I've only towed my 5.5k trailer 500 miles and don't plan on towing again until the spring.) My question is how many fittings do I need to grease on the chassis/front end. should I use a gm product? What do you all suggest. Thanks.
Corrected, thanks OB_1: There are 11 fittings. If I can help with AMSOIL products, just let me know.

Happy Thanksgiving.

Last edited by mrmanners; 11-26-2009 at 06:36 AM.
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