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Old 06-06-2011, 10:13 AM   #1
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Question GMC/Chevy 6.0 engines

What can you guys tell me about the 6.0 gas engine in 2006 Suburban 2500's? Gas mileage etc........ Hows the power when towing... Is 80,000 one owner miles alot for this engine??
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Old 06-06-2011, 10:25 AM   #2
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We currently have have two 3/4 ton Suburbans with the 6.0 liter gasoline engines. One is an '05 4x4 with 101,000 miles on it. The other is an '04 2x4 with 80,000 miles on it. Both have been used extensively for towing Lucy, our 2005 25FB, who weighs 7400# ready to camp.

Both the Subs do a great job of towing the Airstream in all situations. They both get about 10 mpg towing and 13 mpg solo. I have never seen any difference between the 2 and 4 wheel drive in the gas mileage department.

Both the Subs have held up well so far.

Brian
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Old 06-06-2011, 11:25 AM   #3
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I have an '06 Sierra 2500 crew cab 4x4 with the 6.0 and get 14-15 MPG without the Safari 25 FB and 10 to 11 MPG towing. Two weeks ago I went to Fort Lupton to pick up a Hallmark pop top camper and averaged 14.8 going up and 14.1 after the camper was installed. I also have 4:11 gears with a limited slip rear end.
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Old 06-06-2011, 11:35 AM   #4
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I had a 2500 Silverado with the 6.0, it got about 15 solo and 11-12 mpg towing. I towed our 6,000+# Airstream over Cajon pass at 50 mph regularly.
It had 185,000 miles on it when I traded it in.
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Old 06-06-2011, 11:35 AM   #5
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I have a 2001 Yukon Denali XL with the 6.0 litre motor, all-wheel drive, and 3.73 gears. At least one-third of its 80,000 miles have been towing a horse trailer, dump trailer, and recently a 23 foot Safari SE. When I picked up the Airstream in Colorado I got 18 mpg on the way out, and 12 mpg towing the trailer back to California. It has averaged 13 mpg over its life. Absolutely no trouble with the motor so far, and I think you can expect a long life from them if they are properly driven and maintained.
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Old 06-06-2011, 12:26 PM   #6
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Our "Silvester" '06 Chevy Express van 3500 (1 ton chassis) with a 6.0 has performance very similar to Moosetags'. We always use tow-haul when towing. We pull a Safari 25' SEFB. This is a 12 passenger van (3 bench seats behind the front bucket seats) which we find very convenient in lots of different applications. It is the go-to vehicle for our extended family jaunts. When camping we pull out the back seat, have plenty of room for our three shelties with views out the window, and oodles of space for camping gack in the back.

When I'm working on projects all the seats are out and there's more room than a pickup long bed. A 4x8 sheet of plywood lays flat with room to spare at one end.

Silvester owns the road with stability, visibility, maneuverability and pull. The only time we had a problem was pulling up the 14% grade from Lucerne Valley to Big Bear Lake in California, an epic mistake. But that's another story.

I keep synthetic oil in the crankcase and give it regular check ups and baths.
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Old 06-06-2011, 04:20 PM   #7
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I have the 6.0 liter 4.10 axle in my 3/4 ton GMC van. I'm probably in the 11-12 mpg while towing with tow/haul engaged. City use without towing is about 13 mpg. I typically only use the van for towing, hence it only has around 33,000 miles even though it was purchased new in May 2003. It's rated to tow 9,900 lbs.

I use Mobil 1 along with a Mobile 1 oil filter. I change oil annually.

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Old 06-21-2011, 04:51 PM   #8
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6.0L Vortec

Hello,

In regards to your question on the 6.0L Vortec I can provide you with my opinion of the engine.

I drive a 2004 YUKON DENALI XL. It has the 6.0L VORTEC and 3.73 rear end with 4spd tranny. I have a VOLANT cold air intake. As well, a highly regarded trailer dealer on this site recommended I get rid of the sxxty P-rated tires and replaced them with YOKAHAMA GEOLANDER HTS LT:245/70/17.

I have 250,000km or 150,000miles on it. I bought it from my elderly neighbour after he had it for 2yrs with 60,000miles on it, mostly highway as he travels from Canada to California every year.

I can tell you that the 6.0L VORTEC is an excellent engine. I have not had any problems with it. In fact, Our next vehicle will be a newer YUKON DENALI XL with the 6.2L.

My trailer is not an AIRSTREAM (one day it will be). It is a regular style cabin type trailer, 27' long, 3100KG (6200lbs) dry. The 6.0L just plays with this trailer. It pulls it awesome with no issue of power. Pulling an AIRSTREAM would be easier, even though they are heavier.

I live in Central Canada, province of Saskatchewan(prairies). I can tell you that pulling through mountains on our holidays is never an issue. We have pulled through the rockies since 2004 every other year. Last year we were in Fairmont BC. This year we are going back again, travelling the Okanagon, Columbia Valley and Shushwaps. It is one of the most beautiful drives/holidays you will find in an RV.

I have learned after many years of towing that it's never the mountains that are an issue for power regardless of the grades, rather it is the flat ass prairies where you get very strong head winds etc.

The 6.0L never struggles, it works beautiful. I have had this YUKON XL DENALI since Jan.2006 and it is a pure pleasure.

Last week, after a routine maintenance check I did a Transmission rebuild which after 250,00km is alright with me. I run synthetic now in the transmission along with the transfer case & front/rear diff's. Never had an issue with the transmission, but since they had it apart and found 2nd was getting weak, I went ahead with the rebuild since we are doing a long holiday again this year.

Regular driving I get 17L/100KM or about 14 US MPG or 16.5 IMP gallons.

Highway driving at 120kmh or 70mph I get 14L/100KM or about 17 US MPG or 20 IMP gallons.

Towing depends on where we are travelling, however, our trip last year towing from Saskatchewan (prairies) to the British Columbia Rockies and back averaged 24L/100Km or about 10 US MPG or 12 IMP gallons.

My typical speed while towing is 95-100km/hr or 55-60 miles/hr.

I hope this helps.

Take care,

Mike from Canada
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Old 07-06-2011, 07:21 AM   #9
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K&N Air filters

and emission control devices......I have a 2004 Sierra Denali all wheel drive, quadrasteer...136000 miles. I get about 10 miles to the gallon towing the 25FB Safari, or not. It has been a great tow vehicle and no major issues.....just minor

now i am having "check engine" light issues......been hooked to the OBD and it indicates that the mass air sensor and 02 sensors are acting up.....

several mechanics have railled on the K&N as the prime source of the MAS failure.....

any thoughts
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Old 07-06-2011, 07:46 AM   #10
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Originally Posted by kingfisher24 View Post
and emission control devices......I have a 2004 Sierra Denali all wheel drive, quadrasteer...136000 miles. I get about 10 miles to the gallon towing the 25FB Safari, or not. It has been a great tow vehicle and no major issues.....just minor

now i am having "check engine" light issues......been hooked to the OBD and it indicates that the mass air sensor and 02 sensors are acting up.....

several mechanics have railled on the K&N as the prime source of the MAS failure.....

any thoughts
Have the mechanic's removed the filter and inspected, or just condemned it after seeing the sticker? Only a clogged filter would be suspect. Have cleared the codes?, and the same codes return.

I have used K&N filters on both my Suburban,(95&06) TV's, they have never been the source of any fault codes.

You could try cleaning the sensor wires in the MAFS with carb cleaner, if it has been running rich the 02 sensor will most likely have to be changed.
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Old 07-06-2011, 08:01 AM   #11
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If you over oil a K&N, it will cause MAF issues. This is a case where "a little dab will do ya". Just enough oil to turn the material pink after cleaning with the K&N detergent. THAT'S ALL! just barely pink.

I've used K&N in my two vehicles for over 10 years in this manner....no issues.
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Old 07-06-2011, 01:44 PM   #12
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K&n

it has been in use for 100,000 miles...oiled the same every time......mech took it out and cussed me a blue streak, called me a dumb a-- for using it.... MAS was cleaned yesterday and i have driven 250 miles and light has not come back on....yet
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Old 07-06-2011, 02:45 PM   #13
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it has been in use for 100,000 miles...oiled the same every time......mech took it out and cussed me a blue streak, called me a dumb a-- for using it.... MAS was cleaned yesterday and i have driven 250 miles and light has not come back on....yet
We drive a lot up north on the back roads, so I check the AF often. Have to take the intake air tube off anyway, so it's a good time to give the sensor a squirt at the same time. Even under normal conditions they can get crudded up. What did they say about the O2?
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Old 07-06-2011, 03:05 PM   #14
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it has been in use for 100,000 miles...oiled the same every time......mech took it out and cussed me a blue streak, called me a dumb a-- for using it.... MAS was cleaned yesterday and i have driven 250 miles and light has not come back on....yet
Your mechanic seems very ... uninhibited. Someone you know personally? Or just someone who doesn't know how to treat paying customers?
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