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New 2015 Sierra owner

lschafroth

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lschafroth Enthusiast

lschafroth

Posted
Posted

I just purchased my first new vehicle in 20 years. It is a 2015 Sierra All Terrain SLT Plus.

 

I have a few questions:

 

How do you break in the engine?

What tire pressures do you run? (live in Texas, lots of heat) 20" Tires

Do you drive it like you want it to run or do you baby it for the first few thousand miles?

 

Lannie

 

PS I was told to rev it to 5500 rpms, then let it go down to 2000 for a few seconds, then back up. Do this 15 times. Then drive it fairly aggressively for the first 2000 to make it run like you want.

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

Congrats on what sounds like a beautiful truck. Exciting times for you mate. Cheers.

I honestly don't think there is a break in period. Well I never babied mine anyway. After 50 miles I was driving like I stole it. I mean now many times you gonna be red lining a 5500 lb brick per day anyway?

Any pics?

tw627x Enthusiast

tw627x

Posted
Posted

I just purchased my first new vehicle in 20 years. It is a 2015 Sierra All Terrain SLT Plus.

 

I have a few questions:

 

How do you break in the engine?

What tire pressures do you run? (live in Texas, lots of heat) 20" Tires

Do you drive it like you want it to run or do you baby it for the first few thousand miles?

 

Lannie

 

PS I was told to rev it to 5500 rpms, then let it go down to 2000 for a few seconds, then back up. Do this 15 times. Then drive it fairly aggressively for the first 2000 to make it run like you want.

Everyone has different break in methods, it all depends on the mechanic you talk to. my buddy is a gm mechanic and he has always lived by the drive in second gear and get to 4000 rpm then let off the gas until you come to a stop. do that a few times. Usually by 500 miles the rings have seated so anything after 500 is pointless. thats what hes told me and what i've gone by. like I said everyone will tell you something different.

 

Tires i usually go recommended psi. I always go 33-35 knowing they will warm up and increase a bit.

I just purchased my first new vehicle in 20 years. It is a 2015 Sierra All Terrain SLT Plus.

 

I have a few questions:

 

How do you break in the engine?

What tire pressures do you run? (live in Texas, lots of heat) 20" Tires

Do you drive it like you want it to run or do you baby it for the first few thousand miles?

 

Lannie

 

PS I was told to rev it to 5500 rpms, then let it go down to 2000 for a few seconds, then back up. Do this 15 times. Then drive it fairly aggressively for the first 2000 to make it run like you want.

Everyone has different break in methods, it all depends on the mechanic you talk to. my buddy is a gm mechanic and he has always lived by the drive in second gear and get to 4000 rpm then let off the gas until you come to a stop. do that a few times. Usually by 500 miles the rings have seated so anything after 500 is pointless. thats what hes told me and what i've gone by. like I said everyone will tell you something different.

 

Tires i usually go recommended psi. I always go 33-35 knowing they will warm up and increase a bit.

SouthernSilveradoGuy85 Senior Enthusiast

SouthernSilveradoGuy85

Posted
Posted

I believe they break them in before installing and I'm sure it's with break-in oil. Some people on here changed their oil after only 500 miles just to make them feel better, but it doesn't say that you have to, I just waited until the 7,500 mile mark to change it the first time. I read in the manual to allow 500 miles for it break in the rest of the way and all it says is to not go on long trips in that period. I still did though. I did a 300 mile round trip to the beach and drove another 100 at the beach and I don't think it did anything. Being that it's 6 speed (or 8 speed if you have the 6.2) then it shouldn't be a problem with RPMs unless you hot rod around.

 

Also your trans might feel clunky and shift hard at time, it's just in learn mode. Mine would act like that but stopped completely after 1-2,000 miles. Some don't seem to get it, but some do. For this is say so drive like you normally would so it can learn your driving style.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

Recent article I reads years ago stated it is all about the heat cycles. Getting the engine up to temp, then allowing it to cool and then getting it up to temp. I don't break mine in, I drive them as I plan on driving them from the get go.

 

Tier pressure is pretty easy, I run 37f and 33r on mine. Leaves a nice even wear across the entire tire tread. On the stock setting the front seem to be squatting since most of the weight is on the front end.

lschafroth Enthusiast

lschafroth

Posted
  • Author
Posted

Thanks for all the feedback! I drove a similar Sierra SLE Texas edition as a loaner while they put on my bed cover and locking lugs for me. The loaner had 1600 miles and had much more spunk than mine.

 

They told me it used by the salesmen and its driven like a loaner!! :) I've been driving it like a stole it after 500 miles so we will see. I just put my wheels at 38 cold. Should I drop the rear a few PSI since I have no load?

 

I was looking for a Silverado but when I saw the darker blue All Terrain I was sold. Its still GM and I love em both.

thewhitestallion Senior Enthusiast

thewhitestallion

Posted
Posted

don't worry about breaking in the engine, just drive it like you would drive it if it had 20k miles. I run 35 in my tires.

 

That color looks bad a$$, I love that color but would never buy it. Welcome to the forum!

POS VETT Enthusiast

POS VETT

Posted
Posted

That's a pretty blue. Congratulations and welcome!

 

Regarding tire pressures, please refer to the owner's manual. If the truck is not used for hauling or towing much, I would reduce the pressures by a few psi especially for the rear. The 20" tires have a shorter sidewall and, depending on your preference, the ride can be perceived as rough by some people. If so, reducing the tire pressures a bit might help with such perception.

 

I babied mine for around 2-300 miles which were not just for powertrain and driveline but also for brakes. First oil change was not until about 2200 miles and that was mostly caused by the fact that the truck was already in the shop. I wouldn't worry about a break-in procedure, these engines are designed to run almost right out of the box. The notion of break-in period when bearings and rings need to "wear" while using a certain type of oil is no longer the case.

LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

I babied mine for the first 1k miles but that's probably cause I had trans issues with my last/ other truck lol.

 

I will say, I changed the diff fluids out at around 800 miles and the rear was black and filthy and the front was milky. Just food for thought. Gonna be doing a trans filter here soon too

crafferty Senior Enthusiast

crafferty

Posted
Posted

Awesome color choice! It reminds me of the crazy metallic blue that some of my hot wheel cars had when I was kid. As far as break in period goes I really never do anything different. On this truck you could say my break in period was the 900 mile trip home from the dealer.

Crf450r420 Enthusiast

Crf450r420

Posted
Posted

I ran the stock crap tires at 42 psi as they are rated at ful load in the 50s. I'm doing 35 to 36 now with Michelin tires as the full load rating is much lower. Wouldn't hurt to go easy on it for 500 miles as the manual explains.

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