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Add engine oil!!!

Truston Gunter

By Truston Gunter
in 6.6L Gas V8 (L8T)

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Chuck FB Enthusiast

Chuck FB

Posted
Posted

I imagine your winter ( which is probably more like our normal summer temps ) would be kinder to the temps or at least control it better. In reading about humidity I haven't come across proper information to say one way or the other if its a net negative or positive on engine temperature but it has effects with the actual air density as in decreasing air density with high humidity and the obvious which is your high ambient temperatures are not where its at for cooling, or power for that matter. 

 

Oddly the 3.0 diesel from what I am seeing on a mechanics videos is set up to have stupid high trans temps at a minimum as well, yet the gas counterpart half ton is designed to run a lot cooler when driving empty. Doesn't make a lot of sense to me why they are doing that but GM must have their reasons ... or its EPA pushing them. 

 

If your able to get 14 at what I assume is still a fair pace down the highway, that's all one can expect from a gasoline truck with the shape of a brick. Only by going slower and a consistent speed and no head wind etc can one get into some better numbers. 

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Flatus
Flatus

Mine burns excessive amounts of gasoline.

diyer2
diyer2

While I have never approached things like an engineer would, I have just kept motors in an as new condition and changed the oil and filters. I do applaud the science part but never used it and never h

MacLaren
MacLaren

Ok fellas, I've got a 2021 Gasser, just took in for an oil change (every 5k) and, they told me she wasn't even low. And, we've been on 5 camping trips during this 5,000 mile stretch. We haul an 11,000

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Pryme Senior Enthusiast

Pryme

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3 hours ago, Truston Gunter said:

I'm pretty sure the "best" was downhill with the wind at my back!!! lol 12-14 is what I usually get on the highway unloaded

That’s because you drive 80+ all the time which I believe you stated a couple of times in the past. The difference between 70 and 80 is massive for these trucks. There is no speed limit over 70 near me so I’ve only hit 80 on very few occasions. 

Pryme Senior Enthusiast

Pryme

Posted
Posted
4 minutes ago, BuckWallace said:

Pretty much any time I'm over 65 I noticed the MPG hit, especially when towing.

It takes exponentially more power and wind resistance to push a big brick through the air as you go faster. Add in a head wind and it can change things quickly. 

Truston Gunter Enthusiast

Truston Gunter

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1 hour ago, Pryme said:

It takes exponentially more power and wind resistance to push a big brick through the air as you go faster. Add in a head wind and it can change things quickly. 

So your saying I should put a hitch on my vette to take advantage of the aerodynamics for towing........

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Pryme Senior Enthusiast

Pryme

Posted
Posted
53 minutes ago, Truston Gunter said:

So your saying I should put a hitch on my vette to take advantage of the aerodynamics for towing........

That’s why I pull a fifth wheel with my motorcycle that has one horsepower for every 3.3 pounds of bike weight. Moves it super nice ha

  • 7 months later...
BuckWallace Enthusiast

BuckWallace

Posted
Posted
16 hours ago, Grumpy Bear said:

https://engineoiljournal.com/engine-oil-consumption-chart/

Was this created by GM?! Just kidding, but this is interesting. I change my oil every 5k miles or 6 months (I don't put a ton of miles on my truck), and I hadn't had any noticeable consumption on my 2024 L8T until this last oil change at a little under 25k miles. This OCI was about 4500 miles and I lost about 1/2-3/4 of a quart, so well within this "normal" consumption range. I was a little bummed to see that much gone since I hadn't noticed any loss before, but I'm not going to worry too much about it.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
5 hours ago, BuckWallace said:

Was this created by GM?! Just kidding, but this is interesting. I change my oil every 5k miles or 6 months (I don't put a ton of miles on my truck), and I hadn't had any noticeable consumption on my 2024 L8T until this last oil change at a little under 25k miles. This OCI was about 4500 miles and I lost about 1/2-3/4 of a quart, so well within this "normal" consumption range. I was a little bummed to see that much gone since I hadn't noticed any loss before, but I'm not going to worry too much about it.

 

If I had a L8T that used nothing for 25K then just starts using a quart in 4,500 I'd be thinking either PCV system has got an issue or the oil control ring drains in the piston are starting to plug. Valvoline Restore and Protect will bring it around if it's rings and it just might be. It could take another 20K to clear them. 4 changes at 5K each. But should see results within the first two. 

Truston Gunter Enthusiast

Truston Gunter

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Posted

The comment about this article created by GM was spot on!!! lol I still have the same issue/experience. I can positively say in my situation, the oil consumption I experience is directly related to my towing. I still try to drive the speed limit on the interstate where there is minimum traffic and the truck does not like it! With wind I sometimes get 4 MPG!!!!!!! oddly enough, if I tow a utility trailer that weighs almost 10K versus my camper which is only 7K and the difference is huge! Guess that wind sail makes all the difference.  Happy towing everyone!!!!

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MORSNO Enthusiast

MORSNO

Posted
Posted
1 hour ago, Truston Gunter said:

The comment about this article created by GM was spot on!!! lol I still have the same issue/experience. I can positively say in my situation, the oil consumption I experience is directly related to my towing. I still try to drive the speed limit on the interstate where there is minimum traffic and the truck does not like it! With wind I sometimes get 4 MPG!!!!!!! oddly enough, if I tow a utility trailer that weighs almost 10K versus my camper which is only 7K and the difference is huge! Guess that wind sail makes all the difference.  Happy towing everyone!!!!

 

Wind is the biggest factor in my mileage hauling my truck camper! However, I've never seen a change in oil consumption while hauling it in thirteen years (6.0 gasser). 

James Beyer Enthusiast

James Beyer

Posted
Posted

Common Sense tells me something is Wrong.  GM will put Bulletins and point fingers, just like the Denial of afm Distroying my engine on a 2018 6.2l.

I'm old school, the Only Time you should need to add Oil is if your way over Oil changes or way over working an engine but pulling a 7500 pound trailer is not it.

I know it says at 7500 miles oil change, but heck it could say 10,000 miles if GM wanted to convince people, but I change around 5000 miles even though it has become very expensive.

Really like this 6.6l gas, but if people are using oil, especially 2 quarts, GM has a problem and they need to figure it out before it becomes another recall.

Just my 2 cents,

Later- 

 

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Pepper has 192,000 on her and doesn't use between 5K changes. Recently I've shortened that OCI to 3,750 in response to new formulations of lower TBN and ever lower AW packages. I also don't run 0W20 in anything. 

 

I didn't put the link up because I agree but rather to give others a 'gauge' of what to expect from their OEM's lack of response to their inquiries. 

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Homer1959 Enthusiast

Homer1959

Posted
Posted

I wonder how the EPA concluded that burning 1 quart of oil per 1,000 miles—so about 5 quarts over a typical oil change interval—creates less pollution than the fuel savings from their specifications and restrictions. I’m no engineer, but 5 quarts of oil burned and released into the atmosphere by 500,000 trucks doesn’t seem much better than a small increase in fuel consumption.

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KARNUT Senior Enthusiast

KARNUT

Posted
Posted
1 hour ago, James Beyer said:

Common Sense tells me something is Wrong.  GM will put Bulletins and point fingers, just like the Denial of afm Distroying my engine on a 2018 6.2l.

I'm old school, the Only Time you should need to add Oil is if your way over Oil changes or way over working an engine but pulling a 7500 pound trailer is not it.

I know it says at 7500 miles oil change, but heck it could say 10,000 miles if GM wanted to convince people, but I change around 5000 miles even though it has become very expensive.

Really like this 6.6l gas, but if people are using oil, especially 2 quarts, GM has a problem and they need to figure it out before it becomes another recall.

Just my 2 cents,

Later- 

 

I don’t like cylinder deactivation. My odyssey has it. It is on way longer than my GM was. I got it from my daughter by trading my mother in law’s CRV for it. She went by the minder. I did several quick oil changes and do 5K oil changes. At 166K I can’t tell except for the light it’s on. With a lite foot I get 25 MPG in town. Same at 72 MPH on the Hwy. My brother in law with his 2013 Tahoe at 180K with 5K oil changes has no issues. Both of us will keep them until they die. They ain’t worth much. Except to us. 

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      Some Assembly is Required

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    • nfisherman
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