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?

 

[cookand]

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 M1 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 M1 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 EPS 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 EPS 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!