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2003 GMC Sierra 1500HD 6.0L #5273354 11/21/19 07:17 AM
Joined: Sep 2018
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Redright9 Offline OP
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Hello! Here is the report for my truck. Its a '03 GMC SIerra 1500HD 6.0L. The truck gets used mainly as "the family truck", it hauls and tows, plus many normal trips the auto parts store and hardware store on the weekends. The bad thing is it just doesnt get driven a lot. I have only averaged about 5k a year on the truck. So I have been changing the oil once a year.... Here is what my report looks like for the latest oil change:

Attached PDF document
03 SIERRA 1500HD-191102.pdf (44.22 KB, 64 downloads)
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273370 11/21/19 07:41 AM
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Snagglefoot Online Content
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Thanks for the post. The 6.0 is one reliable work horse. My 08 6.0 has 180,000 miles.


If you want the job done right......do it yourself.
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273390 11/21/19 08:09 AM
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WyrTwister Offline
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Is the 6.0 an " LS " engine ?


Wyr
God bless
Re: 2003 GMC Sierra 1500HD 6.0L [Re: WyrTwister] #5273394 11/21/19 08:17 AM
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Snagglefoot Online Content
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Originally Posted by WyrTwister
Is the 6.0 an " LS " engine ?


Yes.

https://en.wikipedia.org/wiki/LS_based_GM_small-block_engine


If you want the job done right......do it yourself.
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273409 11/21/19 08:29 AM
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Redright9 Offline OP
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[Linked Image]

Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273472 11/21/19 09:52 AM
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Miller88 Offline
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This is an 8 lug1500 right?


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273477 11/21/19 10:01 AM
Joined: Sep 2003
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Brons2 Offline
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Nice report, wear metals a fair amount below universal averages.

I imagine in Kern County CA this truck could last just about forever with this regimen and the low mileage you put on it.


2012 Hyundai Sonata GLS 6MT 2.4GDI, ProDS 5w & 10w30 seasonal, XG9688 filter, 2018 Mitsubishi Outlander SEL 2.4 CVT, Dealership Castrol 0w20, Mazda filter.
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Miller88] #5273487 11/21/19 10:13 AM
Joined: Sep 2018
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Redright9 Offline OP
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Yup.. 8 lug 1500..... And yes, this truck will probably last me a very long time... I try to drive it more, but i just don't.. Not the trucks fault (other than the fuel economy, the only downfall of the truck), It just doesn't get out much...

Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5273817 11/21/19 04:43 PM
Joined: Jul 2005
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dave1251 Offline
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Looks great. Keep treating her well and your grandchildren will have a reliable vehicle to use.


make the inside of your engine oil cap white.
don't use.
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5275722 11/23/19 07:21 PM
Joined: Jun 2018
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Spitter Offline
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How is your oil pressure? I have a 2004 6.0 swapped into a half ton. I have about 30-35 on a cold start idle, 18-20 warm idle and around 30-35 warm at highway speeds. I use 0w40 castrol currently. I get 12-15 warm idle on 10w30 pup.


2004 Silverado 5.3
Pennzoil ultra platinum 10w30 acdelco upf44
2006 Buick lucerne 3.8
Pennzoil ultra platinum 5w30 acdelco pf47
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5275829 11/23/19 10:00 PM
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Macsignals Offline
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Originally Posted by Redright9
Yup.. 8 lug 1500..... And yes, this truck will probably last me a very long time... I try to drive it more, but i just don't.. Not the trucks fault (other than the fuel economy, the only downfall of the truck), It just doesn't get out much...


This makes me miss my heavy half Ram 1500... 8 lug 3/4 ton with leaf springs (2012 so last year for those before the 3/4 tons got coils) with a 1500's hood and badging. Never should've gotten rid of it.

Good looking report, long live the six liter LS engine.


-Ian A.
Mine:
2016 GMC Sierra 1500, L83 5.3L V8. Castrol Magnatec 0w20, Bosch 3502 oil filter. Daily driver.
1992 Dodge Dakota, 3.9L V6. Delvac 10W30, Napa Silver filter. Out of service for restore.
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5277139 11/25/19 03:00 PM
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Posts: 3,871
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Smokescreen Offline
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I have the brother to the OP truck...its a good truck...only had to replace oil pressure sending unit and change the starter.

I had BlackBear tune the ECU and it is peppy....gets slightly better fuel economy as well. It is a very basic truck and that is what I like.


13 Civic Si 2.4L-105Kkms(66Kmi)-QSUD,Wix
05 LeSabre 3.8L-294Kkms(184Kmi)-QSUD,Wix
03 Sierra 2500 6.0L-209Kkms(130Kmi)-QSUD,Wix

All with mpg > EPA
Re: 2003 GMC Sierra 1500HD 6.0L [Re: Redright9] #5277150 11/25/19 03:16 PM
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Redright9 Offline OP
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My oil pressure seems good.. Warm idle about 25-30, cruising 40ish.... So far so good... I have seen some others GM engines run low oil pressure on idle, but this one seems ok. I thought about doing a BlackBear tune, but right now just run the 87 octane Diablo "canned tune". I put a size larger tire on the truck and wanted to just adjust the speedo and compensate for the larger tire.

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