HPL now has Dexos D 5w-30

[smokey_2020]

Was it your first run? Might need some time to do the cleaning, if you have stuck rings.

Problem with LM2 and LZ0 not as much with stuck rings, problems with EGR temps, so oil needs to be stout to temp burn off but with EGR temps being in 1000+ doubt any oil can do. Why I say that - it burns only if I drive 70mph+ for 3-5+ hours, or up in the mountains. In normal city driving or if I go 60MPH almost no burn.

 

[Plumb Bob]

Problem with LM2 and LZ0 not as much with stuck rings, problems with EGR temps, so oil needs to be stout to temp burn off but with EGR temps being in 1000+ doubt any oil can do. Why I say that - it burns only if I drive 70mph+ for 3-5+ hours, or up in the mountains. In normal city driving or if I go 60MPH almost no burn.

If there's one, it would be a HPL blend. Tried the No VII Euro?

 

[WarEagle]

Problem with LM2 and LZ0 not as much with stuck rings, problems with EGR temps, so oil needs to be stout to temp burn off but with EGR temps being in 1000+ doubt any oil can do. Why I say that - it burns only if I drive 70mph+ for 3-5+ hours, or up in the mountains. In normal city driving or if I go 60MPH almost no burn.

Interesting. I appreciate your posts. I had been considering a switch to either Amsoil or HPL for my ‘21 LM2, just because. lol.

I’m at ~73K miles with no burn and been using Mobil 1 ESP since ~10K. I drive ~60 miles/day, mostly ~70mph, but no elevation around here

 

[smokey_2020]

Interesting. I appreciate your posts. I had been considering a switch to either Amsoil or HPL for my ‘21 LM2, just because. lol.

I’m at ~73K miles with no burn and been using Mobil 1 ESP since ~10K. I drive ~60 miles/day, mostly ~70mph, but no elevation around here

I went back to Mobil 1 ESP X2 0w20 this oil change since I did not see a benefit of the HPL Dexos D 5w30. For me the price/value ratio was not there but I must say that HPL team was outstanding to work with and very friendly. I know some guys run Mobil 1 ESP (non-X2) in 5w30 weight but it is not Dexos D certified oil.

 

[Hohn]

Keep us posted on my LM2 Tahoe if I travel on highways at 70+ MPH and in mountains LM2 burns a quart in 5K miles. On flat 65 MPH burn is not noticeable. In my nonscientific testing of LM2, HPL statements on 0w20 volatility comes true. Everyone keeps talking about tight tolerances of modern diesels designed for 0w20 and 5w30 being too dense for it thus GM pulling 5w30 from the Dexos D list.

Clearances, not tolerances.

And realistically, the bearing clearances haven't changed a whole ton within a given engine size and style range. This is because the physics of what makes a journal bearing work are pretty well understood and have been for a long time, and CAFE doesn't change that. The ability to hold a given amount of precision in production hasn't radically changed in 30 years either.

And let nobody doubt-- the thinner oil was mandated first, then the engine was engineered to try to survive around it. But it turns out that you can only hold clearances so tight in production, since most modern engines are already under 0.001" on the main bearings. Rods get more clearance because they distort more under load, but it's still pretty small (under 0.0025" usually).

Which means every engine that had the "recommendation" to use 20 grade oil arrive from thin air when previously that engine called for 30 grade did so by sheer force of regulatory will forcing you towards sub-optimal viscosity grades.

 

[smokey_2020]

Clearances, not tolerances.

And realistically, the bearing clearances haven't changed a whole ton within a given engine size and style range. This is because the physics of what makes a journal bearing work are pretty well understood and have been for a long time, and CAFE doesn't change that. The ability to hold a given amount of precision in production hasn't radically changed in 30 years either.

And let nobody doubt-- the thinner oil was mandated first, then the engine was engineered to try to survive around it. But it turns out that you can only hold clearances so tight in production, since most modern engines are already under 0.001" on the main bearings. Rods get more clearance because they distort more under load, but it's still pretty small (under 0.0025" usually).

Which means every engine that had the "recommendation" to use 20 grade oil arrive from thin air when previously that engine called for 30 grade. Well, this is just sheer force of regulatory will forcing you towards sub-optimal viscosity grades.

Appreciate the succinct educated answer. I am not concerned about running 5w30 in my engine, I just need to get the oil that is stout and will not mess emission system that is "sensitive" on 3.0s. I am seeing many other oil manufacturers adding "meet/exceed" Dexos D statements to their product sheets, including 9020 from Schaeffer, light Diesel from Amsoil, HPL. I assume that Dexos D is only signifying that D-blended oil will not foul emission right off the bat.
Anyone has success with running Mobil 1 Extended PerformanceS 5w30 (not-Dexos D) in their LM2 or LZ0?

 

[Hohn]

Appreciate the succinct educated answer. I am not concerned about running 5w30 in my engine, I just need to get the oil that is stout and will not mess emission system that is "sensitive" on 3.0s. I am seeing many other oil manufacturers adding "meet/exceed" Dexos D statements to their product sheets, including 9020 from Schaeffer, light Diesel from Amsoil, HPL. I assume that Dexos D is only signifying that D-blended oil will not foul emission right off the bat.
Anyone has success with running Mobil 1 Extended PerformanceS 5w30 (not-Dexos D) in their LM2 or LZ0?

I'm sure that the heavier oil is the right call here and the HPL formulation will work very well for you!

 

[UNC006]

This is becoming an old thread, but the number of Dexos D certified 5W-30 oils has grown to 12. I'm sure they'll be several more coming soon because they're are coming straight from the Dexos 2 certified list, which has 60 5W-30 oils and Dexos D is replacing as soon most the oil makers pony up the dough to pay GM test them.

What's most interesting to me is the one 0W-40 oil listed on Dexos 2, Mobil 1 ESP X3. It was only API SN rated. Their new X4 version of this oil is API SP rated. So, I would expect to Mobil 1 ESP X4 0W-40 Dexos D certified soon too, not that it would stop me from using it. However, it's over $10/qt....ouch

 

[DGW444]

It's wild how a hot 5w30 manages to lubricate (10.2 cSt) just fine at 100 C given the 0w-20 was that exact same vis at 92 C, and somehow the engine managed not to destroy itself during warmup when it passed through that temperature.

Across the range, the difference in vis between the two grades is about 5 C, or about 9 F.

"Everyone" needs to realize it's molehills, not mountains. Trivial difference. "Everyone" focuses on the HUGE increase of 10.2 vs 8.7 difference at operating temperature while ignoring viscosities in the range of 200-400 for cool startup, climate dependent.


View attachment 244585

I have been patiently waiting for my LZ0 3.0 Duramax to blow up running Mobil Delvac 5w-40 (HDEO) for the past 7,500 miles. Instead it returned a used oil analysis with the lowest wear metals I have seen for these engines yet. I will let everyone know when the engine blows up.

 

[johnmyster]

I have been patiently waiting for my LZ0 3.0 Duramax to blow up running Mobil Delvac 5w-40 (HDEO) for the past 7,500 miles.

This is the way.

Delo 5w-40 is lower SA...if you happened to stock up on it fall 2024.

 

[UNC006]

View attachment 323184
I have been patiently waiting for my LZ0 3.0 Duramax to blow up running Mobil Delvac 5w-40 (HDEO) for the past 7,500 miles. Instead it returned a used oil analysis with the lowest wear metals I have seen for these engines yet. I will let everyone know when the engine blows up.

How cold has it gotten where you're from since you’ve been running 5W-40? Been using block heater?

 

[DGW444]

How cold has it gotten where you're from since you’ve been running 5W-40? Been using block heater?

The coldest we have seen is about 12 degrees in the morning when I needed to start it. I didn't use the block heater because I was traveling and it started with no problem. I do use the block heater if it is in the teens and 20's at home because I think it is easier on the engine regardless of what viscosity in it and I like getting in and having instant heat.