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2500hd 6.0l V8 vs. 2500hd Duramax

Pros, cons, life expectancy

Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby Thomkadl1989 [OP] » Jan 25 2019, 6:37am

Ya getting a leak down test would be a good idea.. have any idea how much a shop charges off hand?
That last post was pretty long, but what I was trying to get at is are rebuilds looked as a positive and more desirable?
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby silentbravo » Jan 26 2019, 8:12am

Rebuilt engine/trans/diff by trusted shop is probably fine. Check the exhaust manifold bolts, and see if any are broken off. Super common for the NBS trucks. Inspect underneath well, checking for rusted frame/crossmembers/etc.

As far as anything different or pro/con for newer trucks (07-13 NNBS), in 08 or 09 the 6 speed trans was offered, and it's much superior to the 4 speeds before it. Makes a good difference in mileage and it's a nicer trans overall but your budget may be a bit low to find a decent truck that "new". Other than that and higher engine hp/tq, there isn't anything significantly better between the NBS (99-06) trucks and NNBS (07-13). I still think NNBS is ugly, and interior isn't anything special, but the 6 speed trans is really nice.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby Pugly » Jan 27 2019, 10:03pm

I have the 6.0L and I'm happy. I'd love more power but it seems to get along just fine.

I hauled my 4000 lb camper and a small trailer with my ATV, generator, extra water, gasoline and propane - probably another 1500 lbs.

Went down the OR coast into CA and back home up over Donner Pass. Sure the diesel would have gone faster but it was no big deal to me and the higher rpms don't bother me a bit.

I bought used, couldn't afford new so I had two choices. A low mileage gasser or a high mileage diesel. I chose the low mileage gasser.

The diesels in my price range were roughly 5-6 years old with a 150,000+ miles on them. I bought a 2 year old gas with only 20k on it.

Had I bought the diesel with 150k on it I'd be sitting on a 10-11 year old truck right now with 320,000 plus miles on it.

For me the 6.0L was the better choice of the two.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby starspangled6.0 » Jan 27 2019, 10:16pm

I've had both variants you speak of. Being in the rust belt, bodies usually give up the ghost before motors, so the price variant between a used diesel and a used 6.0 isn't too great.

The fuel econ in a diesel is better than a gas, but not by too much. You'll never see the breakeven point, unless diesel drops $1\gallon. Maintenance-wise, they are also more costly, but the data I've collected over the years of ownership doesn't point to more breakdowns in a diesel. It's just that when they do, it's typically more expensive.

I bought my latest Duramax because the body was the right style (a rare 6.5' bed with a crew cab in a 2500HD). In the winter, I use it to go to work during storms (I'm in commercial snow management), and I'll use it for projects all around the house during the summer. Overkill? Definitely, but I can't shake the diesel addiction. $700 spent on quality tuning will net me well over 100 HP, and you can't beat the sound of a diesel at full tilt without an exhaust on. The sound, the power, the noise - it's all just wonderful for me. Practically speaking, I could have gotten a 6.0 and been just as happy.

I will say something about the LB7: the only thing wrong with them is the injectors. Once they're replaced by yourself or the prior owner, they're far superior to Ferds or Dudges from that model year range. Don't be afraid to look at lower-priced LB7s if you can prove the injectors were done.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby Copperhead » Jan 27 2019, 10:53pm

The only thing that probably gripes me is when folks will do all that to a diesel and then put on a megaphone for a exhaust tip that magnifies the sound level. Not bad if they are not around me, but when I am pulling a tough hill with my semi truck and have the driver window down, it really is a PITA to have one of those idiots come by me and I get the full effect in my window from their exhaust. At least with the twin 5" stacks on mine, they are 13' above the ground where they won't be a direct shot to someone's ear drum.

But there a childish things all sorts of people do with diesels with no consequence to how it affects others.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby hatzie » Feb 02 2019, 3:10pm

Some more food for thought.
The common wisdom about the huge difference in fuel mileage between the Dirtymax and the 6.0L is BS. The difference is underwhelming.
Here's some apples to apples comparison info from crowdsourced raw fuel mileage data. This site has you record miles price and gallons at every fill up and calculates the mileage from that data.
2005 Dirtymax Fuel Mileage on average is 14-16mpg --->http://www.fuelly.com/car/chevrolet/silverado_2500_hd/2005?engineconfig_id=156&bodytype_id=&submodel_id=
2005 LQ4 6.0L Fuel Mileage on average is 11-13mpg --->http://www.fuelly.com/car/chevrolet/silverado_2500_hd/2005?engineconfig_id=62&bodytype_id=&submodel_id=

Looking at data from different years shows the same underwhelming difference in fuel mileage. The 2500HD fuel mileage on the 6.0L gasoline & the 6.6 Dirtymax Diesel seems to be pretty static across multiple years. 11-16mpg across 2005-2018 Model Year trucks.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby adam86107 » Feb 02 2019, 3:54pm

Fuelly isn't a good tool for comparison. Someone that tows more is likely to be more attracted to the diesel. Fuelly doesn't take into account loaded and unloaded mileage.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby hatzie » Feb 02 2019, 4:46pm

adam86107 wrote:Fuelly isn't a good tool for comparison. Someone that tows more is likely to be more attracted to the diesel. Fuelly doesn't take into account loaded and unloaded mileage.


Yes and no. I was just posting a sanity check.
When you put together enough data you can see the averages. Heavily laden is an outlier as is the driver that gets 22mpg by driving 45mph on the interstate just to prove it can be done. The outliers are there in the bar graphs as well. The Diesels dip as low as the 6.0L trucks.
It would be nice to have loaded and unloaded miles but the fact remains there's not enough of a difference in fuel mileage to make up for the higher additional initial cost and the higher cost of maintenance on a Diesel.

How many laden miles does Joe Sixpack put on his Dirtymax?
I'd guess that more than 65% of them never see more than 5,000 lbs behind the truck in its' lifespan... and that's if anything gets towed with the truck ever.
Individuals that tow with their trucks more than 35% of their miles are fairly rare.
Individuals that tow more than 10,000 lbs for that 35% are pretty rare birds too. 5th wheel trailers can get up to 16,000-18,000 lbs but those are expensive and there really aren't that many of them out there.

Is the power of the diesel cool? YUP.
When you step back and look at the things you can do with the money you'd be spending on that Dirtymax... Is it really worth the price difference to most people? NOPE.

cool points win with most people anyway but it would be less than honest to not point out the lack of difference in fuel mileage.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby clearlake outdoors » Feb 02 2019, 6:06pm

Ive had gas trucks all my life. Bought a 18 2500 Duramax 4x4 almost 1 year ago. 13,000 miles now.
Have not had any issues. Best tow rig ive ever had.
Just towed the trailer to Grand canyon and back (2000 mile trip)
On the highway towing about 65 i get 12-14 mpg , Any faster or wind it drops to around 10 mpg. Best 50 mile stretch with out the trailer is 25.2 mpg.
The exhaust brake is wonderful on down grades.
Insurance and registration is very costly and fuel in Cal is 1.50 more per gal than out of state.
Never thought i would be a diesel guy but love the truck. Power is incredible and love how quiet it is.
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Re: 2500hd 6.0l V8 vs. 2500hd Duramax

Postby intheburbs » Feb 02 2019, 6:39pm

I love the LY6 in my Suburban 2500. I tow, a lot, including an 8600-lb trailer, and yes, I've dragged it through the Eisenhower Tunnel and over Powder River Pass. Am I winning any races? Surely not. Has anything broken, or have I even felt in the slightest bit unsafe/in danger? Nope. And this usually includes having my wife and kids aboard. The six speed works well with the 3.73 rear. If for no other reason, you should look at 2007 and up just to have the six speed. Makes a BIG difference towing heavy.

The truck has been flawlessly reliable, despite the fact that I drive it like I stole it, and just generally beat the snot out of it.

I bought it in '13 with 100k miles, it now has 185k miles and is still perfect. Everything works like it should, all components are original. About a third of that 85k I've put on it is towing.

Cost of ownership? Not counting fluid changes and tires, I've spent less than $200 on it in five years. What's that work out to? About 11 cents a day?

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