Duramax Diesels Forum Truck of the Week
  #1  
Old 10-13-2018, 01:43 PM
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duckmans83 duckmans83 is offline
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Default Dreaded questions, fluids and filters

So, 2 days ago I just picked up a 2005 crew cab 4x4 dually duramax with 5 speed automatic with 124k miles on it. I will be putting about 5k miles a year on this with a 12k lb trailer.

I'm starting to research about all the fluids and filters I will need. Not sure how accurate the fuel filter and oil meters are. Oils says 73% and fuel filter is reading 100%.

Oil and fuel filter were changed recently and trans was changed at 90k.

Figured 125k miles would be a good time to do everything so looking at power steering, brake, trans, diffs, transfer case, and coolant fluids and filters. Any recommendations, websites, and/or links would be great! Also looking for any must due mods like the intake to turbo pipe that is restricted.

Any good places or websites to order these items would also be great!

I'm coming from a ford 7.3 so know all about that and have alot to learn about the lly duramax.

Thanks for any help!

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  #2  
Old 10-13-2018, 02:19 PM
CarolinaHD CarolinaHD is offline
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Start in the owners manual, it lists all the fluids you need. I got my Allison stuff and transynd through a local big truck shop. Everything else came from the parts store or buy filters in bulk on ebay. Deep in the tech articles on dieselplace.com you'll find how to threads on hydroboost/power steering fluid swap, transmission fluid, etc.
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Old 10-13-2018, 02:22 PM
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Will do. I guess the factory filters and fluids are the way to go?

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Old 10-13-2018, 02:52 PM
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A little worried about these head gaskets. Just read up some more on it. I did check the upper radiator hose and it wasn't stiff when cold or hot.

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Old 10-13-2018, 03:39 PM
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For the power steering fluid just unhook the return line from the hydroboost (rubber line) and run a longer hose into a catch can. With the truck running, start pumping the brakes and turning the steering wheel 1/4-1/2 turn either way. Make sure you keep the reservoir filled and keep doing it till you get clean fluid. Probably take about a gallon.
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2004 2500hd GMC. Mike L. trans, EPR twins. 620hp/1100tq. bought new in June 2004. Sold on 12/28/16 .
2007 classic 2500hd Chevy (Blacula) bought 3/16/18.
Rare parts steering w/DHD brace, egr delete, pcv re-route, BD lift pump, duramaxtuner perfect tow tune.
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Old 10-13-2018, 03:41 PM
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And get a cat filter adapter. It’ll save you money in the long run.
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2004 2500hd GMC. Mike L. trans, EPR twins. 620hp/1100tq. bought new in June 2004. Sold on 12/28/16 .
2007 classic 2500hd Chevy (Blacula) bought 3/16/18.
Rare parts steering w/DHD brace, egr delete, pcv re-route, BD lift pump, duramaxtuner perfect tow tune.
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Old 10-13-2018, 04:01 PM
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Thanks darkness! Just use the GM stuff? Not sure what the cat filter adapter is for so mote info would be great.

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Old 10-13-2018, 04:09 PM
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Checked out my owners manual, not as helpful as I would like. Sounds like oil change is once a year or when the dash says so. Also sounds like there are 2 different service messages pop up when things are due. I shouldn't put but 5k miles a year so that works for me. Rotella t6 good for these things? That's what I run in a few things around my house.

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Old 10-13-2018, 04:11 PM
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Haha, Google worked. Fuel filter. I take it the cat filters are cheaper and better?
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Originally Posted by darkness View Post
And get a cat filter adapter. Itíll save you money in the long run.
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Old 10-13-2018, 05:45 PM
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Quote:
Originally Posted by duckmans83 View Post
Haha, Google worked. Fuel filter. I take it the cat filters are cheaper and better?

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yeah sorry about that. Yes they are better and cheaper.
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2004 2500hd GMC. Mike L. trans, EPR twins. 620hp/1100tq. bought new in June 2004. Sold on 12/28/16 .
2007 classic 2500hd Chevy (Blacula) bought 3/16/18.
Rare parts steering w/DHD brace, egr delete, pcv re-route, BD lift pump, duramaxtuner perfect tow tune.
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Old 10-13-2018, 05:50 PM
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Does the percentage thing on the gauge cluster still work? Not sure how the percentage gauge works for that anyways.

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Old 10-13-2018, 06:11 PM
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The oil and fuel filter meter is based on mileage. It doesn’t actually check health.
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2004 2500hd GMC. Mike L. trans, EPR twins. 620hp/1100tq. bought new in June 2004. Sold on 12/28/16 .
2007 classic 2500hd Chevy (Blacula) bought 3/16/18.
Rare parts steering w/DHD brace, egr delete, pcv re-route, BD lift pump, duramaxtuner perfect tow tune.
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  #13  
Old 10-13-2018, 08:29 PM
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Moved to Fluids/Maintenance section.
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Old 10-13-2018, 09:18 PM
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Cat filter doesn’t separate water. So be aware of that. I use t6 for the motor mobil one filter. Transynd for trans, buy filters for it from merchant. Use gm fluid for transfer case and royal purp for axles.
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Old 10-14-2018, 04:42 AM
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Good info, thanks!
Quote:
Originally Posted by Budneeds2beers View Post
Cat filter doesnít separate water. So be aware of that. I use t6 for the motor mobil one filter. Transynd for trans, buy filters for it from merchant. Use gm fluid for transfer case and royal purp for axles.
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