2024 Chevy Tahoe LM2 3,000 miles/65 hours on oil - 3,000 total miles/65 total hours - HPL 0w-20 Dexos D

[JHZR2]

Happy to see GM still offering a diesel in 1/2 ton segment. I see what you see on that filter & is a fresh reminder to replace the filter on a shorter run to get rid of that debris within early break-in period. I'm going to check out that PPE oil filter site, sounds interesting. Great pics. Any oil change plans on this Tahoe w/that HPL? Just curious, Thanks for sharing.

Yes I think this is great. When was the last time? Late 90s in the C/K and mid 90s in the K-blazer?

Part of me really wants one, though I don’t have a real justifiable need given the excessive price of these SUVs.

But they certainly are one of the best things going, and the best option in the truck segment!

 

[OneLonelyBurrito]

The two go hand in hand, so I believe they are trying to keep oil consumption down by reducing EGTs, which helps keep the metallic oil additives out of the DPF.


This is the LM2, which I don't believe has the SCRoF. Correct me if I'm wrong.

Yes, they have to keep the metallic additives out of the DPF, but it also takes a lot of oil burning to plug a DPF with the additives from oil. I remember running into a calculator one of my previous mentors/technical experts on after-treatment systems created for calculating ash loading from oil additives in DPFs playing around with it. It takes a lot of oil to plug them in a reasonable amount of time.

I would hope the proper discussions happened between the after-treatment and engine development team to size DPF and what amount of oil consumption can be expected and or need to protect the DPF.

All versions of the 3.0L duramax (LM2 & LZ0) have an SCRoF. Source

Here is also a screen shot from GM's technical publication on the LM2

The LZ0 has an even more complicated after-treatment system than the LM2

 

[wwillson]

Yes, they have to keep the metallic additives out of the DPF, but it also takes a lot of oil burning to plug a DPF with the additives from oil. I remember running into a calculator one of my previous mentors/technical experts on after-treatment systems created for calculating ash loading from oil additives in DPFs playing around with it. It takes a lot of oil to plug them in a reasonable amount of time.

I would hope the proper discussions happened between the after-treatment and engine development team to size DPF and what amount of oil consumption can be expected and or need to protect the DPF.

All versions of the 3.0L duramax (LM2 & LZ0) have an SCRoF. Source

Here is also a screen shot from GM's technical publication on the LM2
View attachment 219598

The LZ0 has an even more complicated after-treatment system than the LM2

Ah, so there are two SCRs, that's what I was seeing when I was under the vehicle. I thought there was only one SCR just after the downpipe. Thanks for the diagram.

 

[OneLonelyBurrito]

Ah, so there are two SCRs, that's what I was seeing when I was under the vehicle. I thought there was only one SCR just after the downpipe. Thanks for the diagram.

I found the paper over on duramaxforum. Here is a link to the thread about it if you're curious to learn more. Link

 

[loneryder]

Is this engine made by Isuzu? What kind of mileage are you getting so far?

 

[BobsArmory]

Is this engine made by Isuzu? What kind of mileage are you getting so far?

I don't know about wwillson but my 2023 GMC AT4 got 26-27mpg @73 MPH on a same day round trip from Rockford MI to Chicago and 33-35mpg @ 55 MPH on a 150 mile 2 lane blacktop trip Lansing to Adrian MI. (being easy on the go pedal)

 

[fantastic]

Yes I think this is great. When was the last time? Late 90s in the C/K and mid 90s in the K-blazer?

Part of me really wants one, though I don’t have a real justifiable need given the excessive price of these SUVs.

But they certainly are one of the best things going, and the best option in the truck segment!

That's right, those 6.2 or 6.5's are true dinosaurs now.
These are excellent from everything I've seen so far. I think putting them in the SUV's was a good decision. 21's were rated at 460 pound-feet of torque at 1,500 rpm then throw in the 10 speed automatic it's icing on the cake. That's more than my 1995 7.3L Power Stroke (425 ft lbs) was although the F-250 obviously had more payload capacity. It is tempting for sure.

 

[wwillson]

Is this engine made by Isuzu?

No, this is a clean slate design by GM. So far I am highly impressed with the torque, lack of turbo lag, and the fuel economy. The EGR also takes [most of the exhaust - corrected by @OneLonelyBurrito below] AFTER the DPF, so your engine isn't ingesting soot. Big design win.

What kind of mileage are you getting so far?

That was with a 25 MPH tailwind, but my normal cruising down the interstate is right at 30 MPG.

 

[OneLonelyBurrito]

No, this is a clean slate design by GM. So far I am highly impressed with the torque, lack of turbo lag, and the fuel economy. The EGR also takes exhaust AFTER the DPF, so your engine isn't ingesting soot. Big design win.

FYI, it has two EGR systems. A low pressure one that pulls from behind the DPF and a high pressure from that pulls from before the turbo. The high pressure is mostly used during cold start and after-treatment system warm up. The rest of the time it uses the LP-EGR pulling from behind the DPF. So some soot is still getting into the intake system, its just a lot less. So overall, very big a win for keeping the intake clean.

When I drove the LZ0 in my brother's '23 GMC Sierra AT4, I was super impressed by it. The amount get pick up and low end torque were get impressive. Along with the responsiveness of it. It felt like it just always has power.

 

[loneryder]

No, this is a clean slate design by GM. So far I am highly impressed with the torque, lack of turbo lag, and the fuel economy. The EGR also takes exhaust AFTER the DPF, so your engine isn't ingesting soot. Big design win.


That was with a 25 MPH tailwind, but my normal cruising down the interstate is right at 30 MPG.

View attachment 219692

That is awesome. Hope the reliability and durability hold up.

 

[4WD]

No, this is a clean slate design by GM. So far I am highly impressed with the torque, lack of turbo lag, and the fuel economy. The EGR also takes exhaust AFTER the DPF, so your engine isn't ingesting soot. Big design win.


That was with a 25 MPH tailwind, but my normal cruising down the interstate is right at 30 MPG.

View attachment 219692

We are long term Tahoe/Yukon owners - however this TD is never on the lot. One of my guys had to get one shipped from Michigan down south - and that’s a bit ironic since it was assembled in Arlington Texas - and motor up there …

Good read

https://gmauthority.com/blog/gm/gm-...is a,is an all-new design from the ground up.

 

[Bighorn2500]

I recently saw that oil on HPL's website and it did intrigue me. I will have to try it soon. Also I emailed Liam over at PPE about that filter and he stated that the efficiency at 10 microns is 50% and at 20 microns 85%. I would assume that would be better than the ACDelco offering.

So would that make the filter 99% efficient at 30 microns or 35 microns?

 

[fantastic]

So would that make the filter 99% efficient at 30 microns or 35 microns?

Based on the numbers mentioned here it would be 99.75% @28.5 um

 

[BobsArmory]

Hey wwillson Would you be interested in doing a review of your Idash? It looks like an interesting gauge.

 

[wwillson]

Hey wwillson Would you be interested in doing a review of your Idash? It looks like an interesting gauge.

Sure, I'll collect some data and graph the results. That will add to the review.

 

[CleverUserName]

No, this is a clean slate design by GM. So far I am highly impressed with the torque, lack of turbo lag, and the fuel economy. The EGR also takes [most of the exhaust - corrected by @OneLonelyBurrito below] AFTER the DPF, so your engine isn't ingesting soot. Big design win.


That was with a 25 MPH tailwind, but my normal cruising down the interstate is right at 30 MPG.

View attachment 219692

The 3.0 was actually designed by a German firm named FEV. That is probably why it doesn’t suck. GM however does assemble the engine.

 

[fortim]

I know this is an old thread and it looks like this was a custom blend but is this oil available (Dexos D)? @High Performance Lubricants

TIA

 

[BobsArmory]

You can order from their website. Make sure to select 0w-20 D from the drop down menu.

HPL Link

I ordered 4 1 gallon jugs, good for 2 oil changes.

 

[fortim]

You can order from their website. Make sure to select 0w-20 D from the drop down menu.

HPL Link

I ordered 4 1 gallon jugs, good for 2 oil changes.

Thanks!

 

[The Critic]

Does anyone know if this HPL product uses an add pack that is also suitable for other Euro specifications? For instance, Mobil is covering DexosD, Porsche C20, VW 508/509 and MB 229.71 with their X2 0W-20.

On the other hand, Castrol is only covering DexosD and MB 229.71 with their Edge Turbo Diesel 0W-20 product.

It seems like some add pack suppliers are covering numerous specs while others are being more granular.