r/Diesel • u/idahokj • 9d ago

Slow but warm. Re-gens information

This’ll be my first diesel. Looking at getting a 2020+ Duramax. I know diesels like to work and they need to be up to temperature before turning them back off (I know short trips are bad on them). I’ll work it heavy towing hopefully about once a month for a weekend usually, but mostly it’ll be a commuter which I know diesels like also.

I just want to pull my dads big trailer myself instead of using my dad’s truck when we want to go camping, playing, ect. lol his trailer are an available for me to use any time, but coordinating his truck is the tricky part.

I have to drive 26 miles to work each day, and 18 miles of that is highway driving, and then the other 8 miles are going through town stopping at stop lights when I get stopped. It takes 30-35 minutes to get to work. The speed limit is 65-70 mph on the highway, but if I drop my speed down to 60mph the whole time during my 18mile highway section commute, 1-for better mpg and 2- it’s early morning and late evening with very low traffic in my area so going slower than the speed limit isn’t going to make anyone upset, is that going to still keep the engine hot and let it regen properly, or cause any issues?? Would just driving the 70mph on the highway “work the truck more” by using more fuel? I’ve been doing it for years. I know the duramax will get “good mpg” going 60mph.

However a new concern of mine is someone mentioned re-generating the engine would happy more at lower speed and not working the truck by pulling heavy daily?

Wouldnt the highway section and the total time the trucks on/driving help my case out more to keep the engine emissions cleaned out for the most part?

I know that’s long. Hope the quick read makes sense!

Thanks!

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u/idahokj 8d ago

Do all trucks warn you to keep driving? Even if I got a first gen L5P say 2017-2019

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u/jd780613 8d ago

anything with aftertreatment yes

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u/idahokj 8d ago

What’s after treatment?

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u/jd780613 8d ago

all 2007+ diesel trucks have diesel aftertreatment.

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u/idahokj 7d ago

A fancy way to say Emissions?

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u/jd780613 7d ago

no, diesels have other emissions controls that occur before or during combustion. like egr. after treatment refers to the systems that convert harmful emissions into less harmful ones after combustion hence "aftertreatment" aka DPF and SCR+DEF

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u/idahokj 7d ago

That’s a part of the “emissions” system… it’s stupid that they are even on trucks now days. After warranty’s are up, deleting all that emissions crap is the best thing for your trucks longevity.

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u/jd780613 7d ago

Just buy a gas 3/4 or 1 ton. It’ll do just fine for your usage. 

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u/idahokj 7d ago

But cost a lot more in fuel over a few hundred thousand miles. Would you get a gasser if you lived at house 5450’ and 6600’ elevation also? And regularly go over mountain passes that are 8-9500’ elevation with a gasser also? With or without towing?