GM 6.0 engines

bigboreG

Member
Looking at a '02 2500 HD with the 6.0 gas. I have drove a few in the past, seem like good motors. Anyone know of problems to watch out for, good and bad points? I know they like gas, but I dont pull enough to need a diesel. It would mainly be just a work truck.
 
(quoted from post at 19:38:35 01/04/13) Looking at a '02 2500 HD with the 6.0 gas. I have drove a few in the past, seem like good motors. Anyone know of problems to watch out for, good and bad points? I know they like gas, but I dont pull enough to need a diesel. It would mainly be just a work truck.

I know the 6.0s had some issues when first introduced, piston slap, etc., but I'm sure GM got that problem worked out, and considering GM is still offering that engine in the 2013s, I'd guess they must be pretty good. Fuel mileage? A full sized, 3/4 ton truck just plain is not ever going to set any records for miles per gallon, so don't even worry about it.

As a PS, The size of the engine in any given vehicle does not, nor ever will, determine the miles per gallon. Fuel economy is mostly determined by the rear end ratio, and then by the size and shape of the vehicle.
 
Had an 04 2500HD with the 6.0L and 4:10 gearing. Great for pulling trailers but it cost a fortune to drive. Averaged 9-11 mpg. I liked everything else about the truck though.
 
(quoted from post at 20:23:03 01/04/13) Had an 04 2500HD with the 6.0L and 4:10 gearing. Great for pulling trailers but it cost a fortune to drive. Averaged 9-11 mpg. I liked everything else about the truck though.

Your statement proves my theory. I have an '01 with the 4.10 gearing, but with the 8.1 engine. Miles per gallon is the same as yours.
 
Thanks for the info. Dependability and usability matter more to me than gas mileage, in a pickup that is. If I cant use it for what I need, then its no good to me. I can live with 10-12 mpg. We have other vehicles for the long trips, this one woulnt go far from home.
 
Back between 1970 and 1981 the Chev 400 made 150HP and 4mpg. Today the 376/6.0L makes 300-345HP and 13mpg just putting around short trips .
Anybody that calls a 6.0L a gas hog is out of touch.
It"s the owners that install big wide coarse tread low pressure tires after jacking the vehicle up 8" . And drive like crazy then wonder why the truck is a fuel hog.
 
(quoted from post at 19:38:35 01/04/13) Looking at a '02 2500 HD with the 6.0 gas. I have drove a few in the past, seem like good motors. Anyone know of problems to watch out for, good and bad points? I know they like gas, but I dont pull enough to need a diesel. It would mainly be just a work truck.

I have (actually it's in the wife's name, so it's "her truck") an '05 2500 HD Crew 4x4 with 6.0. Got a good deal from the in-laws two yrs. ago, they didn't need it anymore after they got rid of their 30' 5th wheel camper. Have had pretty good luck with it, always starts right up and runs well. Having issues with the ABS sensors right now and they had to put a new rear brake caliper on it when it was fairly new. Don't like the small 25 gal. gas tank, can't get any range on a long trip and the mileage is not good, but only slightly worse than the Ford Expedition I was using to pull a 16' aluminum stock trailer.

I'm no Chevy fan but have to respect that this is a pretty good truck.
 
I drive a couple days a week delivering auto parts. They had a 2004 3500 cube van with the 6.0. Had 465,000 on it when it finally was putting coolant in the oil. Got around 10 mpg. Replaced it with a 2013 3500 with the same 6.0 in it. Gets the same mileage, right around 10 mpg. I check it each tank. It doesn't haul any weight at all, just bulky auto body parts. Probably less than 1000 lbs most trips. Very nice engine, plenty of power, and the first went a ton of miles. I sure wouldn't want to feed it though.
 
(quoted from post at 21:21:17 01/04/13)
(quoted from post at 19:38:35 01/04/13) Looking at a '02 2500 HD with the 6.0 gas. I have drove a few in the past, seem like good motors. Anyone know of problems to watch out for, good and bad points? I know they like gas, but I dont pull enough to need a diesel. It would mainly be just a work truck.

I have (actually it's in the wife's name, so it's "her truck") an '05 2500 HD Crew 4x4 with 6.0. Got a good deal from the in-laws two yrs. ago, they didn't need it anymore after they got rid of their 30' 5th wheel camper. Have had pretty good luck with it, always starts right up and runs well. Having issues with the ABS sensors right now and they had to put a new rear brake caliper on it when it was fairly new. Don't like the small 25 gal. gas tank, can't get any range on a long trip and the mileage is not good, but only slightly worse than the Ford Expedition I was using to pull a 16' aluminum stock trailer.

I'm no Chevy fan but have to respect that this is a pretty good truck.

I fought with the ABS sensors on my truck also. Found an easy fix. Just pull the fuse and be done with it.
 
I drive a 09 5.3L Chevy,325 hp,get 20mpg on highway,10mpg pulling trailer with 2 tracs.,plenty of power,good service. This is my 2nd one,beats 6.0L past all the gas stations.
 
I have a 2003 2500HD with the 6.0 in it. Until I lost my wife we pulled a 38 ft 5th wheel with it.It pulled it good, gas mileage varied depending on how fast I drove, but the worst I got was 7 1/2. the best was 10, by itself I get 12 and if I baby it I get 13. That doesnt happen very often. I am well pleased with the poswr
 
IMHO, one of the ALL TIME best motors ever built by GM.

People tend to talk smack about it because of poor gas mileage or the fact that it has to turn faster than 2100RPMs to pull a heavy load.

It's not a Duramax, Cummins, or Powerstroke. It's a small block gasoline engine, and small block gasoline engines need to rev to make power. If you can't get over that, pay the $11,000 premium for a diesel, but don't expect Ford to fix your fuel pump when it dies on you under warranty.
 
i work for a construction co. where all foremans and supervisors purchase there own truck with there own money then the company reimberses us every month.we can buy any brand truck as long is is a 3/4 ton 8ft. bed.the chevys loaded down with a welder cutting torches and assortment of tools most of them will gross between 4 and 5 ton gvw and most of us get around 12 to 13 mpg.out of 400 different guys with different brand of trucks the fords and the dodges have way more issues than the chevys.this is just what i have been seeing.
RICK
 
I am going for it. Its a regular cab, 4x4 long box. Its loaded, power everything. 160k but has been well maintained and with reciepts for repairs made maintence, etc. Thanks guys for your help!
 
Got a bunch at work from the earliest '99 to a '12. They pull trailers or plow snow about every day. Never had one apart or any major issue. Mine get 6-7 mpg when on a trailer. But so do my 5.7vortecs and 8.1's. My favorite? The 8.1 and Allison. Feels just a fuzz short of my duramax, pretty good for a gasser.
 
I'm driving a 97 with 5.7 and 3:73 gears. Gets 17 mpg to town and back. 18-19 highway. 13 pulling 9000 lbs.
160K on the clock and no major repairs.
 
That is about an ignorant response. Are you rich enough it
doesnt matter to you. I have driven diesels for years. In
2003 I decided with gas prices to change to a 2002 chevy
with 6.0. First trip with 3 JD 3 bottom plow from ks to az I
was having to look for gas every 140 miles. I kept that
pickup for 3 months and traded it in for a duramax. He!! yes
I worry about mileage.
 
Tally up all the operating costs.

Once upon a time the diesel ruled with just a turbo, a mechanical P pump and a five speed. Cheaper fuel too.
The gassers were carburated dogs , low on power, had distrubuters and ran leaded gasoline.

Stepping into the present and thanks to the empire building and influence building by our government employees in the EPA. The diesel is a now a burdened engine. The bunch of bunny hugging pricks are choking it to death. And now the gasser is simple cheap and reliable.
Check the long term costs of running a common rail diesel. Then get ready to be scared if you honestly figure ALL the service costs of a post 2007 diesel.
 
I bet they've taken a lot of front wheel bearings loaded like that. I replaced one at 44,000 in an 06 half-ton, and we've got two duramaxes at work that have taken three, before they hit 100,000.
 
I bought a 2001 gmc 2500 2 wheel drive a year ago just to have something to haul with. Only putting a few thousand miles a year on it. Plain basic truck, standard cab, long box, not a HD. I checked the mileage on the first couple of tanks and it is getting 16 to 17 mpg. Not pulling a trailer just some light hauling and I keep my foot out of it. It has the 6.o engine and about 180,000 miles on it. I put a lot of miles on my car for work so I didn't want a truck as a daily driver.
 
As others have said, 7 to 11 mpg is the norm. Cracked exhaust manifolds is a problem with these motors. Also had the ac compressor, alternator, and water pump go, all with less than 70,000 miles on the clock. It is a 04 used as a shop truck, and winter plowing one parking lot.
 

Sounds like lots of hours on the engine lots of starts, stops. Can't really go with miles on that kind of service.
 
Gotta 2000 long bed, ext cab 3/4 ton 4x4 (3:73 rears) currently at 186k and still averaging 14-17 mpg. Has pulled everything I have ever attached. Wife took it over so...I went and got a newer version (2011) with matching specs and the first 20k mirrors the 2000 model...excepts it smells a lot better inside (but I'm working on that). I specifically asked the dealer for the same powerplant.
 

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