[Farmguy]

Have you been checking what the oil life monitor (OLM) is indicating at the time you are changing your oil?

It doesn't 'test' the oil with a senser.
The number is calculated based on how the engine is being used -- but it will also countdown even if not being used -- so the maximum time before it recommends a change matches the recommended maximum in the owners manual.

I do have a tech background and was skeptical when the OLM's were introduced (in the '80's I think).
At the time my driving pattern was always the same and was changing on my usual schedule, but making note of the OLM status.
My driving pattern changed -- and much to my surprise, so did the OLM recommendation.

Anyway, I now use the monitor - but I also do oil changes to suit my schedule. I don't want oil change to interfere with my busy season, so if it appears that the OLM is going to recommend a change during that period, the oil gets changed early so that interference doesn't happen.

 

[Blueh20Sailor]

I keep track of it. Usually around 70% I'll change. When I tow a lot, the OLM does change...less miles between oil changes

 

[797031]

Hi,
How is your experience with L8T sierra engine?
1. How is reliability?
2. MPG? Avg mpg? Hwy mpg ?
3. Do you experience high oil consumption per 6k miles, even when not towing?
4. Any issues with knock sensor?
5. Do you believe L8T can last 200k miles without major breakdown/repair? Of course assuming one is taking care of service intervals etc.

Deciding whether L5P or L8T.
L5P seems to be great but those regens...
Thanks !
Bob

Just got home from another 300 mile tow, jeep wrangler and a bunch of 16' 2x8's. It just keeps getting better. Tows like a dream, if you want to go fast, it will go fast. I wish it had a 40 gallon tank though.

 

[lineman1234]

Just got home from another 300 mile tow, jeep wrangler and a bunch of 16' 2x8's. It just keeps getting better. Tows like a dream, if you want to go fast, it will go fast. I wish it had a 40 gallon tank though.

A 40 gallon tank is only 4 more gallons. Isnt yours 36?

I put a 45 gallon in the bed for towing days.

 

[Krieg]

2022 HD 6.6 Gasser. 21k miles, 35" Nitto, no lift. I'm in Michigan, took a trip to Colorado and averaged 12-13mpg. Towing a boat, averaged 9.9 mpg. It tows great! I'm amazed at how well it tows. I used to drive a Dodge Cummins, and this engine tows almost the same as the diesel.
I go the speed limit, towing or not.
The only issue I've had is oil changes at the dealer. As some have mentioned, I don't wait for 10k miles, I'm 4-6k miles max oil change. Every oil change I've had, the dealer claims and oil pan leak. I've looked, and while there is a bit of oil near the pan, it's never enough to actually drip. It seem to come from the front of the pan/engine where it is open (I'm not well versed in engine terminology). I've talked to GM about it, they will buy it back, but I'm not interested in that. I love the truck and have way too much $$ in extras..Borla cat-back, ceramic, etc..

View attachment 972138

35's on stock wheels and no lift or leveling kit? And no issues?

 

[dhett77]

At 5000 lbs, probably could use a 1500 instead of an HD.

If towing every day, do you think a 1500 would do with that load? Or would a 2500 be better for a daily towing?

 

[buckwild27]

If towing every day, do you think a 1500 would do with that load? Or would a 2500 be better for a daily towing?

A 1500 will tow 5000lbs just fine. Your gas mileage will be 💩 around 5 to 10mpg at best.

 

[Farmguy]

If towing every day, do you think a 1500 would do with that load? Or would a 2500 be better for a daily towing?

Yes, I'd also stick with my 1500 for towing that daily.
Mileage will depend on if there a lot of stops/starts , speed changes, how fast it will be travelling and the aero load created by the trailer.

 

[dhett77]

Yes, I'd also stick with my 1500 for towing that daily.
Mileage will depend on if there a lot of stops/starts , speed changes, how fast it will be travelling and the aero load created by the trailer.

I have a 6x12 enclosed I tow for work daily. I was looking at getting a trail boss with a 6.2. Figured the 6.6 could be much difference in gas lol

A 1500 will tow 5000lbs just fine. Your gas mileage will be 💩 around 5 to 10mpg at best.

I’m not getting much better in my Toyota now

 

[Farmguy]

I have a 6x12 enclosed I tow for work daily. I was looking at getting a trail boss with a 6.2. Figured the 6.6 could be much difference in gas lol

Kinda off track for an L8T thread but, if fuel cost is going to be a consideration:

6.2 runs on premium fuel.
5.3 runs on regular.

I don't know how fuel prices compare in your area, but here regular and diesel being priced similar to each other and premium is about 22-25% more.

On a 1500, the 3.0 purchase cost is the 5.3 and the 6.2.
All three run the 10 speed.

My last 5.3 and last 6.2 were both 8 speed trucks.
They usually got 19 or 20 when doing daily driver duties.
My '23 3.0 gets 29's doing the same job.

You won't get that mileage towing, but the mpg ratio should be similar.

3.0 has a 5 yr / 100,000 mile powertrain warranty.

 

[buckwild27]

When the 5.3l kicks the bucket in my 2014 sierra I'll be replacing it with a L8T.

 

[RDF1]

When the 5.3l kicks the bucket in my 2014 sierra I'll be replacing it with a L8T.

I thought about building a 408 for my 2500hd but the more I think about it, I keep going back to a 6.0 or at most a 370ci and just throw a turbo on it.

 

[dhett77]

Kinda off track for an L8T thread but, if fuel cost is going to be a consideration:

6.2 runs on premium fuel.
5.3 runs on regular.

I don't know how fuel prices compare in your area, but here regular and diesel being priced similar to each other and premium is about 22-25% more.

On a 1500, the 3.0 purchase cost is the 5.3 and the 6.2.
All three run the 10 speed.

My last 5.3 and last 6.2 were both 8 speed trucks.
They usually got 19 or 20 when doing daily driver duties.
My '23 3.0 gets 29's doing the same job.

You won't get that mileage towing, but the mpg ratio should be similar.

3.0 has a 5 yr / 100,000 mile powertrain warranty.

That 3.0 seems like it does good.

 

[lineman1234]

Its flat hear and i drive moderate. After what seemed like 10,000 miles my 6.6 gasser, 2024 3500 broke in, as well as spring hit and no winter blend gas fuel. ( yes, there is winter gas and diesel fuel thanks to the guberment ) Around 18,000 miles on it now. I dont do much stop and go but some is with each tank, rural speeds 57-62, sometimes 67 and 78 on the interstate. A solid average is no less than 16.5ish per tank, best about 18 once, with 87 ethanol. I can live with that as its really a big wind sail with big stock tires, a bit heavy also. Its nice to just run 87 octane. IF one wants to call it that. Hear up north its hard to find non ethanol fuel. I tried 2 tanks of 91 at about .55 more per gallon and netted 1 more mpg, so not worth it. I was able to find regular 87 and ran 2 tanks, at that time it was actually cheaper at that place than my normal place forced to get ethanol blend, it noted a solid 1.5-2 more mpg without the ethanol. All winter diesel was a solid $1.35 more per gallon than gas, and still is at least .50 cents more than gas. My driving comparing my past diesel to the new gasser is .50 cents a gallon tank to tank cost, the gasser getting less fuel economy. Not including def and the cost of the motor for the diesel.

I fulltime rv it, so the camper is home. I tow a simple 10,000lbs 5ver, for about 4,000 miles total a year then the pickup is a car the rest of the time. I had a diesel 2500 for the last 8 years, and short trips arent best for a gasser, and really arent good for a diesel. Most of my driving is short trips.

The simplicity of the 6.6 L8T is amazing after having a turbo diesel, a 2015. Its seems to like to pull/tow, it adjusts per load and headwind, speed and such, picks a gear and does its thing.

 

[buckwild27]

I thought about building a 408 for my 2500hd but the more I think about it, I keep going back to a 6.0 or at most a 370ci and just throw a turbo on it.

I personally was never impressed by the 6.0. But one with a Snail vacuum on it would probably change my mind. 😃

 

[RDF1]

I personally was never impressed by the 6.0. But one with a Snail vacuum on it would probably change my mind. 😃

Yes.. it makes a big difference. When i took the turbo off my truck years ago it was miserable to tow with. Put a new turbo on and was back in business.

 

[Ralph Munden]

Hi,
How is your experience with L8T sierra engine?
1. How is reliability?
2. MPG? Avg mpg? Hwy mpg ?
3. Do you experience high oil consumption per 6k miles, even when not towing?
4. Any issues with knock sensor?
5. Do you believe L8T can last 200k miles without major breakdown/repair? Of course assuming one is taking care of service intervals etc.

Deciding whether L5P or L8T.
L5P seems to be great but those regens...
Thanks !
Bob

I have not had any problem with the moter. I would like better gas mileage. It 2022 GMC 2500

 

[davester3500]

I have not had any problem with the moter. I would like better gas mileage. It 2022 GMC 2500

Don't press so hard with your right foot.

 

[lineman1234]

I think 16-17mpg solid tank to tank for me is great for a 3500 gasser. Thats 55-60 speed limits areas. On the interstate going 70-80 its not good, but neither was my past diesel pickup at those speeds.
If i can find it for a comparative price, non ethanol fuel in 87, i gain a solid 1.5-2mpg.

Cost mile per mile, past diesel vs new gas pig, .50 cents a gallon diesel being more than gasoline, is the brake even point for my driving. Diesel was $1,35 more a gallon all last winter than gas. Since i bought the gasser, diesel has been a solid .40 cents up to the said $1.35 more a gallon, in areas i was/am in.

Same with towing my 5ver, i get around 2mpg less that in did with the diesel, and i was only towing a TT with the diesel, so cost is about the same. Less the cost for DEF fluid, let alone the motor cost.

 

[RDF1]

I think 16-17mpg solid tank to tank for me is great for a 3500 gasser. Thats 55-60 speed limits areas. On the interstate going 70-80 its not good, but neither was my past diesel pickup at those speeds.
If i can find it for a comparative price, non ethanol fuel in 87, i gain a solid 1.5-2mpg.

Cost mile per mile, past diesel vs new gas pig, .50 cents a gallon diesel being more than gasoline, is the brake even point for my driving. Diesel was $1,35 more a gallon all last winter than gas. Since i bought the gasser, diesel has been a solid .40 cents up to the said $1.35 more a gallon, in areas i was/am in.

Same with towing my 5ver, i get around 2mpg less that in did with the diesel, and i was only towing a TT with the diesel, so cost is about the same. Less the cost for DEF fluid, let alone the motor cost.

This is why i stick to the gas burners..