How To: Service your Duramax Diesel The Right Way

Today is maintenance day so I figured I would show you all some basic maintenance on a 2002 GMC Sierra with an LB7 Duramax Diesel engine. Doing services like this is pretty regular stuff but if you are new to diesel ownership then maybe this will help you out when you go to tackle your own maintenance. Don’t be intimidated by what you hear or read, doing this stuff isn’t that bad and you will save a good amount of coin doing it yourself.
I do my oil changes every 5,000 miles using conventional 15/40 oil. I also do the fuel filter and transmission spin on filter every year OR 15,000 miles. There is an internal filter in the pan of the Allison transmission but it is not done as frequently, I service that one about every 45,000 miles. Just so we are clear, no book or manual told me these numbers, it is just the frequency that I like to do them. I hope this helps some of you out, all the filters, parts, and tool I used are listed below. Please leave a comment below and let me know what you think or if you would like to see other maintenance items or repairs done.

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The products I used in this video will be listed below, please use my Associate links as I earn a small commission from qualifying purchases at no cost to you.
Products:
Mobil Delvac oil:

AC Delco fuel filter:

Allison Spin on transmission filter:

AD Delco oil filter:

Fuel Water In Fuel sensor:

Fender liner retainers:

Tools:
Form A Funnel:

Merchant WIF wrench 2001-2010:

Merchant WIF wrench 2012-2016:

Push Pin pliers:

FIlter wrenches:

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[maryhoffman]

As a new owner of 2004 duramax, I appreciate your knowledge. It's definitely expensive. I've done maintenance on gas vehicles. Diesel is a other world for me. You're a great teacher!

[aaronmcalister]

You can also remove the Battery on the RH side to get acess to fuel filter

[ThePhinista]

Awesome video! Just got a 2023 2500hd durmax.

[miguelito]

Great video man thank you so much I'm a new 2005 GMC owner and this is great to know

[DavidStone-qz]

I liked the video. Where did you get your brass bleed screw for your fuel primer pump? My plastic one need to be replaced.

[herrprepper]

Having an oil analysis done is an extra step that I do annually on all my diesels… 1984 GMC K2500 6.2L (bought new)… 2007 Jeep Grand Cherokee with 3.0 Mercedes diesel (bought used)… and a 2009 Sierra 1-ton Duramax (bought new).

[EZBinTx]

Great video man! Should be top video for #Duramaxmaintenance!

[AbelMolina-qy]

Shell T-6 full synthetic is a lot better oil than mobile one. And pure power oil filters are better you only buy once

[MalikWong]

how much transmission fluid do you top off for new filter? im new to this too

[highlytenacious]

Is it ok to mix oil and tranny fluid for recycling?

[nickledimez]

Great video! Keeping it simple and concise. Have you done the pump rub fix for the transfer case?