6.0 vs. 8.1liter engine

[KMGZ400]

great looking truck, needs tow mirrors. best GMT800 color

[carload4916]

great looking truck, needs tow mirrors. best GMT800 color

The problem with tow mirrors is it will make the truck to wide for my garage. Right now, if I am not careful, I will hit the mirrors.

[dewfpo]

Thanks.

 

I got a question about engine oil. On the oil cap, it says to use 5w30. How important is it to use 5w30? Why does it say to use such a thin oil in this type of truck?

 

What causes you think 5W30 is a thin oil? That is a very old wives tale that holds no water.

 

A 0W30, 5W30 and 10W30 oil all have a similar viscosity at engine operating temps (100C/212F rating). The #W number reflects it's flow characteristics when cold (0C/32F rating).

[yukon25008.1]

When i was talking to ray from 'raylar'after i had the cam installed, I was asking about oil/fuel.. he told me he never understood wh gm says to put 5/30 in the 8.1 he told me to run 15/40.

Edited March 28, 2013 by Sierra35008.1

[brainpause]

Nice ride!

[dewfpo]

I run 0W40 in mine. I drive in -20F to +105F so the 0W40 works great for me. It also seems I go thru a little less oil with the 40 weight on the high side.

 

DEWFPO

[navik22000]

The 8.1 motor is very strong, uses about a quart of oil every 2000-3000 miles. The gas mileage is around 8-11, but when towing, it will not drop too much. The 6.0 uses about a quart every 4-5000 miles, mileage ranges from 12-15, but when towing it will drop to 6-10. The Ally transmission only came with the 8.1 or D-Max. The 6.0 came with the 4l80, and the new ones come with the 6L90( it's a 6 speed, and some think its a Ally, but it is not). The 8.1 also came with a beefed up 4L80 called a 4L85. Good luck.

Hi.whats house/power via 8.1 L ?

And Torque?

 

Sent from my Lenovo TAB 2 A8-50LC using Tapatalk

[SpartanAutoworx]

I have owned just about every combination GMT 800 truck that's been made. 6.0 hands-down every day. All of The trucks we used to tow are 6.0 trucks. Pulls 8.1 Duramax trucks all day long without notice.

[Shawn Beltran Therrien]

I was thinking of getting a 6.0 gmc that had 72k miles on it. I took it for a test Drive and once I reached about 65-70 mph I would hear rattling in the engine bay and the check engine light would be flashing. The guy told me that it was back firing and I said that’s Bs I don’t think it is. Would anyone know what exactly would be making that sound cause I have a few theories just not sure.

Edited December 31, 2019 by Shawn Beltran Therrien

[Shawn Beltran Therrien]

2 minutes ago, Shawn Beltran Therrien said:

 

[riverbanks]

Truck needs to be scanned,what's the codes?

[David89GMC]

GM big blocks are 70's technology with looser tolerances than new engines like the LS series. Loose engines don't seal as well, so they use more oil, that's about it. 300+ horsepower in a truck used to be amazing, now the LS begins at that rating, and they're derated from the factory. A lot of folks tow very successfully with the stock 6.0/4.10 combination. Add an aftermarket tune and the stock 6.0 will easily make 350 horsepower and 400 foot-pounds of torque. That should be plenty of power for civilian use. So what if it can't keep up with a Diesel dually full-time tow vehicle, the 6.0/4.10 is an all-around truck. It can tow or haul most of what folks need.

 

Unrelated Diesel versus LS opinion:

My nephew, and the guy I bought my 2500HD from, both swear by Diesels. They're "young" and want to tow at 70 or 80 mph whether it's safe, legal or whatever, no matter the cost. I almost bought a used F-250 SuperDuty 7.3. Took one look at the rebuild cost of a 7.3 and couldn't believe my eyes, ran down the street screaming LOL. One injector costs $600, and there are eight! Transmissions that sit behind Diesels are the same, very expensive to repair. Of course, you get what you pay for. Taken care of, a Diesel truck drivetrain will last 1,000,000 miles without a major repair. An LS-based truck probably won't get one-third that much use before a complete rebuild. But the average guy won't get near that much with his truck. If he does, he can rebuild the whole drivetrain for $5000 easy.

 

 

[David89GMC]

On 3/17/2013 at 4:13 PM, memory1 said:

...

Tell me if this is true. I was just told that a 2500HD is considered the same as a 3500 SRW and a 3500HD is considered a 4500. What are the differences between the 2500HD and the non HD 3500? I am talking years 2007 and earlier.

The 2500HD and 3500 share the same frame, but the 2500HD has a Corporate 14 bolt with 10.5 inch ring gear.