HDMOs differ from PCMOs?

[userfriendly]

In the last few years TBN and SAPs have dropped in HDMOs now that ULSD is the manditory on road Diesel fuel.
Many Diesels are running cats and particulate filters, so they have the same sensitivities as emission controlled gasoline engines.
Several HDMOs now carry API SN cert in addition to their latest API "C" and various manufacture certs.
API SN has its limitations, and in some viscosity grades they are quite meaningless.
For some unknown reason it appears that most if not all HDMOs have wet clutch applications whether stated or implied. Why is that?
How different is an HDMO 10W30 from a PCMO 10W30, in their base oils and additive packages?
Since motorists regularly use HDMOs in their gasoline engines, could a 10W30 PCMO be used in a Diesel engine instead of a HDMO in the same grade?
Shannow, you go first.

 

[Shannow]

Originally Posted By: used_0il
Shannow, you go first.


Yes, I use PCMO in my diesel (you can search the oil analysis if you like, engine is ZD30), and use HDMO in my petrol cars (and diesels which allow CG and later).

Do I win a Kewpie Doll ?

As the the rest of your mix of assertions and what resemble questions, I think you could successfully run a whole thread on your own.

 

[supercity]

But these PCMOs have adequate ACEA diesel ratings too.

API specs are not so difficult to meet when dual rated. But It's very hard to meet any sort of modern HDEO spec when combined with an Ilsac rating.

 

[Garak]

Originally Posted By: supercity
But It's very hard to meet any sort of modern HDEO spec when combined with an Ilsac rating.

If not actually impossible, given that HDEOs tend to have an HTHS of 3.5 or greater, while in ILSAC rated 30 is usually 3.0 or 3.1.

 

[userfriendly]

Asking questions often appears to secretly knowing the answers.
The opposite to that is what?
My very 1st post was a topic starter.
I posted, got no response, then tried a few more times. Same thing, nothing except the wise cracks. Then someone accused me of being a comedian, and another told my to get a life.
End of story.
OK, you want funny?
I read somewhere that, at one time or another 90% of the population suffers from diarrhea.
That would put me in the top 10% of people who actually enjoy it.

 

[kschachn]

I don't see any of that but maybe I'm not looking hard enough.

Originally Posted By: used_0il
Asking questions often appears to secretly knowing the answers.
The opposite to that is what?
My very 1st post was a topic starter.
I posted, got no response, then tried a few more times. Same thing, nothing except the wise cracks. Then someone accused me of being a comedian, and another told my to get a life.
End of story.
OK, you want funny?
I read somewhere that, at one time or another 90% of the population suffers from diarrhea.
That would put me in the top 10% of people who actually enjoy it.

 

[userfriendly]

I'm just having a little fun with the jigawatt fraternity.

 

[userfriendly]

They are the ones on the dance floor in my 7 second beer story.