6.7L ..... Worth It?

Timsdually · Aug 1, 2022

I went from gas to diesel and I can tell you as long as diesel's are still being made, I will buy them.
I tow a lot between cargo trailer, car hauler, fifth wheel, and now, just bought a 14,000lb gooseneck.
With gas, I could not get more than 13 driving around town and 15 on the highway.
With diesel, I get 15-16 around town and 18 and change on the highway. This is with 6.7 HO, Aisin, dually, 4:10.
With just my cargo trailer in gas, never better than 10. Diesel, 12-13.

fnfal · Aug 1, 2022

HEMIMANN said:
If you go Hemi, be sure to use a premium oil and filter. The roller lifters and camshaft are marginally lubricated - they never fixed the design. App. 5-10% of these engines fail without proper lubrication.

I would buy this engine again, knowing how to lubricate it. It's still the best HD on the market, IMHO.

I use Royal Purple oil filter and Valvoline full synthetic 10w30 summer and 5w20 in the winter. I do all my own maintenance including changing out the diff oil and trans/filter every year.

fnfal · Aug 1, 2022

sandawilliams said:
I just returned from an 11 week trip pulling my RV. My gas total was 3150.00 That SUCKS.

Political content removed, please refer to the Forum Rules (specifically #10) which you agreed to when you signed up. https://www.ramforum.com/threads/ramforum-com-site-rules.179830/

fnfal · Aug 1, 2022

Timsdually said:
I went from gas to diesel and I can tell you as long as diesel's are still being made, I will buy them.
I tow a lot between cargo trailer, car hauler, fifth wheel, and now, just bought a 14,000lb gooseneck.
With gas, I could not get more than 13 driving around town and 15 on the highway.
With diesel, I get 15-16 around town and 18 and change on the highway. This is with 6.7 HO, Aisin, dually, 4:10.
With just my cargo trailer in gas, never better than 10. Diesel, 12-13.

I heard that if you delete the emissions your mileage goes up o 19-20. Not sure how true that is or if at some point the environmental folks might through ya in the slammer. I have no idea how strick that all is. But, honestly that was something I was considering if I went diesel.

Timsdually · Aug 1, 2022

You would void your warranty.
I have no problem with emission equipment. It is seamless in it's operation on my 2020.
It is also seamless in it's operation on my wife's 2018 EcoDiesel Grand Cherokee.

HEMIMANN · Aug 1, 2022

Timsdually said:
I went from gas to diesel and I can tell you as long as diesel's are still being made, I will buy them.
I tow a lot between cargo trailer, car hauler, fifth wheel, and now, just bought a 14,000lb gooseneck.
With gas, I could not get more than 13 driving around town and 15 on the highway.
With diesel, I get 15-16 around town and 18 and change on the highway. This is with 6.7 HO, Aisin, dually, 4:10.
With just my cargo trailer in gas, never better than 10. Diesel, 12-13.

Your load demands it. If you compare the extra price along with the extra price for the fuel, you'll find the payback mileage way out there around 200,000 miles. As I've said - the modern diesel is so expensive only a large load can justify it finanacially.

Danny Phillips · Aug 1, 2022

I pulled my 12,000-pound + fifth wheel from CA up to WA and finally down to AZ a lot of mountain driving. I got 14 MPG average, and I really like the engine brake. Now we are settled in Star Valley, AZ and I drive to town a couple times a week, 4 miles one way. my engine and tranny seem to warm up just fine. However, I only get around 13 mpg here. 2015 RAM Laramie 2500 HD 4x4 crew cab long bed w/ 28,000 miles. I thought about getting a 3500 with the Aisen Transmission, but I don't tow anymore. Just a daily driver.

Timsdually · Aug 1, 2022

HEMIMANN said:
Your load demands it. If you compare the extra price along with the extra price for the fuel, you'll find the payback mileage way out there around 200,000 miles. As I've said - the modern diesel is so expensive only a large load can justify it finanacially.

I am getting 25-33% better mileage than gas depending on what I am using the truck for. This is also with a 3500 dually with a 6.7 vs a 2500 gas that was a 5.7 Hemi and also a 2500 gas Chevy 6.0. So gas cost vs diesel cost is close to a wash. Diesel just dropped below $5 here.
I drive this as a daily driver too. Very happy with the mileage. Oil changes are cheap. Dealer always has a full synthetic special running for $109. I can't barely buy the 12 qts of oil and filter for that.

fnfal · Aug 1, 2022

Like I mentioned in my op, I am getting 6-7mpg when towing on any grades/hills. When highway cruising pulling the 5th wheel I average 9. I was off on the weight of my 5th wheel. Our old bumper pull was 8k. Our 5th wheel (new last year) is 10,500 lbs. Grand Design 278BH

HEMIMANN · Aug 1, 2022

All I encourage is do the math if finances are of concern. A couple members have done so and reported their results. My point is based on their results - not just selected cost parameters. It's called life cycle cost analysis.
I'm commenting because I did that years ago to ensure I didn't throw thousands of dollars away.

fnfal · Aug 1, 2022

HEMIMANN said:
All I encourage is do the math if finances are of concern. A couple members have done so and reported their results. My point is based on their results - not just selected cost parameters. It's called life cycle cost analysis.
I'm commenting because I did that years ago to ensure I didn't throw thousands of dollars away.

Thank you. Point taken

Moose2 · Aug 1, 2022

I guess I don’t worry about whether or not I need vs want something. I buy what makes me happy. I always have a smile on my face when driving my drw pickup, if for no other reason, it pizzles enviro types off when I hog 2-4 parking spaces out in the parking lots. Never quite got how that gets under their skin so much when the lots aren’t full and I’m out in the back 40.

Timsdually · Aug 1, 2022

Moose2 said:
I guess I don’t worry about whether or not I need vs want something. I buy what makes me happy. I always have a smile on my face when driving my drw pickup, if for no other reason, it pizzles enviro types off when I hog 2-4 parking spaces out in the parking lots. Never quite got how that gets under their skin so much when the lots aren’t full and I’m out in the back 40.

That makes driving a dually good for your health. All that extra walking when parking out there.

06 Dodge · Aug 1, 2022

One thing I have not see mentioned is the fact the diesel truck will have a higher resale value then a gas truck an the engine will last a whole lot longer then the Hemi...

huntergreen · Aug 1, 2022

06 Dodge said:
One thing I have not see mentioned is the fact the diesel truck will have a higher resale value then a gas truck an the engine will last a whole lot longer then the Hemi...

It’s a strange new world. Will the resale still be higher than a gasser 5 years from now ?

For the cost of the diesel optioned Cummins, you can by a hemi 6.4 replacement engine.

06 Dodge · Aug 1, 2022

huntergreen said:
It’s a strange new world. Will the resale still be higher than a gasser 5 years from now ?

For the cost of the diesel optioned Cummins, you can by a hemi 6.4 replacement engine.

I think it will and based on the post of Hemi owners is another reason why I bought a truck with a diesel engine...

michael babb · Aug 2, 2022

I have 68k on my 2016 3500 Tradesman with the 6.7 Cummins and I would never get rid of it. Awesome power, 13 mpg hwy under 80 mph, 12.2 pulling a couple thousand pounds of boat and side by side. 12 mpg pulling 1600 gallons of water with tank and 4000 lb trailer. If you need to pass anybody push the pedal and you are at 90 before you blink twice. No mods from factory at all. Owners manual says 15k between oil changes and fuel filters. I cut the secondaroy one open at 15k and it was lily white the primary was totally doing its job so I change it every 15k and the secondary every 30k. Rotella T6 synthetic. About half the time with the exhaust brake fully on, it does not engage, but that is the only fault.

GsRAM · Aug 2, 2022

fnfal said:
Like I mentioned in my op, I am getting 6-7mpg when towing on any grades/hills. When highway cruising pulling the 5th wheel I average 9. I was off on the weight of my 5th wheel. Our old bumper pull was 8k. Our 5th wheel (new last year) is 10,500 lbs. Grand Design 278BH

Well that changes things a bit then. I've always thought, north of 10k your in Cummins territory. With the new 8 speed trans and 4.10s you'd still be fine though, but your borderline. If you don't tow much though and dont put on many total miles each year, I'd still go 6.4 hemi.

GsRAM · Aug 2, 2022

michael babb said:
I have 68k on my 2016 3500 Tradesman with the 6.7 Cummins and I would never get rid of it. Awesome power, 13 mpg hwy under 80 mph, 12.2 pulling a couple thousand pounds of boat and side by side. 12 mpg pulling 1600 gallons of water with tank and 4000 lb trailer. If you need to pass anybody push the pedal and you are at 90 before you blink twice. No mods from factory at all. Owners manual says 15k between oil changes and fuel filters. I cut the secondaroy one open at 15k and it was lily white the primary was totally doing its job so I change it every 15k and the secondary every 30k. Rotella T6 synthetic. About half the time with the exhaust brake fully on, it does not engage, but that is the only fault.

The Cummins has lots of torque. But at 5600 lbs your still under the weights I'm towing and my 6.4/6 speed would do the same on the highway (push the pedal and be over 90 quick)

For a very short distance, less than a mile, no traffic, I did a test and my truck easily towed my TT 80 plus mph. Stable, plenty of power left. I always stay around 60 towing for many reasons, but I wanted to see what it could do. The 6.4 pulls very well for a gas engine and my towing mpg is right around yours, so I don't see much diesel advantage there.

If I was up over 10k loaded trailer weight, I'd strongly consider a 3500 srw (not 2500) Cummins powered truck.

These HD trucks (gas and obvisouly diesel) are very capable. We're all very fortunate in this day and age for that. Years ago in the 80s it was a whole different ballgame pulling with late 70s, 402 powered Jeep wagoneers and 1/2 ton trucks that barely made 200hp on a good day and not at altitude. They still got the job done, but nothing like my Ram.

jejb · Aug 2, 2022

06 Dodge said:
One thing I have not see mentioned is the fact the diesel truck will have a higher resale value then a gas truck an the engine will last a whole lot longer then the Hemi...

That is something that is often left out of these discussions. In my experience having owned all 3, the diesel option on all 3 of the major brands holds its value better than the rest of the truck. Go to any well known website that values vehicles and compare the prices of a 5 year old HD pickup with and w/o the diesel. I'd guess you'll find you get 100% of what the diesel option cost when it was a new truck.

Doesn't mean diesel is for everyone. It's not. But the "math" on the question is not complete w/o considering the above.

6.7L ..... Worth It?

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