HPL now has Dexos D 5w-30

[wwillson]

The back story is the 3.0L LM2 Duramax in my Tahoe uses some oil predictably when operated continuously under load. I define that load as operation with EGTs above ~1050°F, which happens quite often when traveling on grades, headwinds, and when pulling a trailer. The manual calls for Dexos D 0w-20, which @High Performance Lubricants graciously made for me. Initially I was a bit concerned about the oil volatility because I have read many reports of the 3.0L using oil. HPL said the only way to meet the 0w-20 viscosity requirement is to use low viscosity PAO, which has a fairly high volatility, hence the oil consumption.

I asked David Ward if they would blend a Dexos D compliant 5w-30 for lower volatility and higher HTHS, of course he said yes. The 5w-30 should have about 1/2 the volatility of the 0w-20.

I'm going to exchange the 0w-20 for 5w-30 this weekend and the experiment will begin.

This showed up at my door today!

 

[DirectRejection]

D as in "Double W."

 

[daves87rs]

Cool!

 

[fantastic]

That is good to hear that HPL has given its customers a GM D oil. Also, see Euro on the box. I just don't think I could overcome using a 0w-20 in that diesel SUV anyways. Diesel oil needs to be resistant to shearing & a 0w-20 doesn't give you much buffer, while a 5w-30 should allow some shearing w/no problem over longer runs. Good choice.

 

[BrendanC]

i can’t wait to see the results on this. this is why i support HPL both in my personal needs and our commercial needs.

 

[Mewbs]

The back story is the 3.0L LM2 Duramax in my Tahoe uses some oil predictably when operated continuously under load. I define that load as operation with EGTs above ~1050°F, which happens quite often when traveling on grades, headwinds, and when pulling a trailer. The manual calls for Dexos D 0w-20, which @High Performance Lubricants graciously made for me. Initially I was a bit concerned about the oil volatility because I have read many reports of the 3.0L using oil. HPL said the only to meet the 0w-20 viscosity requirement is to use low viscosity PAO, which has a fairly high volatility, hence the oil consumption.

I asked David Ward if they would blend a Dexos D compliant 5w-30 for lower volatility and higher HTHS, of course he said yes. The 5w-30 should have about 1/2 the volatility of the 0w-20.

I'm going to exchange the 0w-20 for 5w-30 this weekend and the experiment will begin.

This showed up at my door today!

View attachment 244534

Is there any kind of additional cost added for custom blend orders? Its great they're willing to do this kind of stuff which is kinda unheard of.

 

[cptbarkey]

It’s great HPL fulfills customer requests, I could see this being something others may want too.

 

[smokey_2020]

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.

 

[YZJB]

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.

It’s called CAFE.

 

[MolaKule]

...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.

I don't know who "everyone" is but bearing clearances are determined by the physics of thermodynamics and the amount of total oil flow available through those bearing clearances.

 

[BobsArmory]

Nice!

 

[burbguy82]

@wwillson

how much extra did the extra blending cost? or is it something they were doing anyway?

 

[johnmyster]

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.

It's wild how a hot 5w-30 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.

 

[Sam_Julier]

That blend sure covers a lot of specs. It would cover 95% of the cars my mechanics service at their Euro Indy shop.

 

[racer12306]

Is there any kind of additional cost added for custom blend orders? Its great they're willing to do this kind of stuff which is kinda unheard of.

how much extra did the extra blending cost? or is it something they were doing anyway?

I came here to ask this.

 

[smokey_2020]

OP @wwillson has the same exact problem as I do - burn off in high EGR temps, if his testing proves that HPL 5w30 Dexos D is indeed helping with burn, then I am sure they will get a few more orders for 5w30 Dexos D. I have tried different 0w20 brands of Dexos D-approved. My observations are non-scientific but I do drive same routes again and again across the state weekly, AC Delco was burning off most, Mobil 1 was slightly less (folks on forums say that Mobil 1 makes AC Delco Dexos D oils but I do not know if true, bottles certainly look very similar). With AC Delco I am 1/2 full on probe shaded area in 4K miles, with Mobil 1 I am 2/3 full after 4K. Of course different weather, season, speed, so many factors that are different but same trips. I wonder if @wwillson will be able to notice the difference in burn off with HPL. Watching this thread.

 

[wwillson]

(folks on forums say that Mobil 1 makes AC Delco Dexos D oils but I do not know if true

Here are the Dexos D licenses

 

[smokey_2020]

OK, I am seeing now that at least 5w30 are on the Dexos D approval list. For the longest time an only approved Dexos D grade was 0w20. That is encouraging as it nullifies the argument that one must use 0w20 grade only, my logic GM says one must use Dexos D-listed oil in Duramax 3.0 meaning that one can use 5w30, I get that HPL is not on that list like many others but at least old argument that Duramax 3.0 is strictly 0w20-only is not relevant anymore.

 

[wemay]

Aren't oils with the actual dexos license supposed to have the dexos logo on the front, and the licensing number on the back of the container? Maybe this HPL does, but i ask because of the original picture shared by @wwillson above.

 

[smokey_2020]

Aren't oils with the actual dexos license supposed to have the dexos logo on the front, and the licensing number on the back of the container?

That part is still true, only select few oils carry GM seals and registration numbers. Old argument and data was that an only approved oil grade for Dexos D was 0w20 as stated by linked page from @wwillson , now Dexos D approval list finally has 5w30 grade. I bet you will not be able to buy 5w30 anywhere but at least GM lists that grade now.