Intro

[SpankyZR2]

Hello everybody,

Thanks for letting me join. I have been cyber stalking this page for a little while now and there’s some great info you all share.
I just bought a 2025 ZR2 Duramax and it’s my first diesel. Any advice for a first time diesel owner?
I love the truck and I am definitely going to out it through its paces with hauling. Thanks in advance for any tips or advice!

 

[ZR2BIZON]

Welcome spanky!

My advice is do not put gas in the fuel tank. No need to thank me.

 

[SpankyZR2]

Very wise words. Thank you.

 

[securityguy]

Welcome and enjoy this amazing beast of a truck!

 

[Kel]

Don’t idle it for too long.

Better to be loaded than not

 

[DNZR2]

Welcome. My advise is to use it for its intended purpose.

 

[securityguy]

Welcome. My advise is to use it for its intended purpose.

Exactly...Church and the grocery store.

 

[22-ZR2]

Welcome, awesome you got the right color.

 

[AXE]

Welcome spanky!

My advice is do not put gas in the fuel tank. No need to thank me.

What about the DEF tank, can you put furl in there since it's right next to the fuel cap?

 

[AXE]

Hello everybody,

Thanks for letting me join. I have been cyber stalking this page for a little while now and there’s some great info you all share.
I just bought a 2025 ZR2 Duramax and it’s my first diesel. Any advice for a first time diesel owner?
I love the truck and I am definitely going to out it through its paces with hauling. Thanks in advance for any tips or advice!

Do your first oil change at 1500 miles to get rid of that nasty "break in" oil. Use conventional 15W40 oil. Then do another at 5000k miles and you can use conventional or synthetic thereafter.

There is a noticeable change in fuel mileage that occurs around 1500-1800 miles. I think there is something in the programming that causes the trucks to run slightly rich probably to keep the cylinder head cooler during break in. You will see 10-13 mpg early, but should get 16+ mpg.

 

[securityguy]

Do your first oil change at 1500 miles to get rid of that nasty "break in" oil. Use conventional 15W40 oil. Then do another at 5000k miles and you can use conventional or synthetic.

There is a noticeable change in fuel mileage that occurs around 1500-1800 miles. I think there is something in the programming that causes the trucks to run slightly rich probably to keep the cylinder head cooler during break in. You will see 10-13 mpg early, but should get 16+ mpg.

So I just turned 1600 miles my friend. Go for the first oil change now? My dealer is giving me 2 freebies...one from GM and the other by the dealer.

 

[DNZR2]

Welcome, awesome you got the right color.

Never mind 22-ZR2 he is off his meds again

 

[AXE]

So I just turned 1600 miles my friend. Go for the first oil change now? My dealer is giving me 2 freebies...one from GM and the other by the dealer.

May as well, or you can do it yourself for about $70. I would use the free one if they are only good for a short time. Diesel oil is some filthy shit too, so you need to take some extra time to lay down some protection on your driveway or garage floor. It stains like nothing else.

I did my first one early at 1000k, then 5000k , I'm now at about 9k and will do another with labs. Then go to every 5000k with synthetic. It worked well on my last two and never had an issue in 10+ years of owning them.

 

[securityguy]

May as well, or you can do it yourself for about $70. I would use the free one if they are only good for a short time. Diesel oil is some filthy shit too, so you need to take some extra time to lay down some protection on your driveway or garage floor. It stains like nothing else.

I did my first one early at 1000k, then 5000k , I'm now at about 9k and will do another with labs. Then go to every 5000k with synthetic. It worked well on my last two and never had an issue in 10+ years of owning them.

Thanks...she's going in tomorrow for the free OC.

 

[PBSlinger]

The HD ZR2's are legit!

 

[ZR2BIZON]

I heard AmsOil was pretty good somewhere

 

[securityguy]

I heard AmsOil was pretty good somewhere

Me too...but I think you have to buy a Sixpack

 

[ZR2BIZON]

What about the DEF tank, can you put furl in there since it's right next to the fuel cap?

The DEF hole is actually a bonus hole. You can put what ever you want in there

 

[ZR2BIZON]

Me too...but I think you have to buy a Sixpack

You did not just go there Amigo

 

[AXE]

Thanks...she's going in tomorrow for the free OC.

Also make sure they install the correct filter. There were a lot of early 24s shipped with PF66 filters and the shop manual calls for one, but that is an error, as it should be PF63. Mine came with a white sticker that said replace with PF63. So they knew they had bad information out there and purpose agreed that socket so dealers and shops would know. Probably not am issue on yours since it probably had the PF63 like mine. But the dealer may not know.