Why are there not many 10W-40 HDEO's?

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FCD

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Most of the HDEO's you see are either 5W-40 synthetics or 15W-40 conventional oils , but i really could not name a single 10W-40 HDEO off the top of my head other than Shell Rimula R6, just curious.
 
Partially because of demand. There is little/no recommendation for 10w40 HDEO.

Same reason there is no 0w20 HDEO. What engine specs it?

For most Semi Tractors oil choices are going to be: 15w40,5w40,10w30

So... guess what the most popular grades of HDEO are....
 
The high temperature viscosity is different for 10W-40 and 15W-40. Grades intended for diesel are 3.7 cP and grades intended for passenger car are 3.5 cP.
 
u can see in my sig, 10w40 HDEO and yes maybe there is uncommon using 10w40 since maybe better full synthetic or just conventional than just only synthetic blend


and also in manual book not so many mention using 10w40 grade.. mostly 5w40, 15w40, 10w30, 5w30 and 20w50
 
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Off the top of my head Scania and Mercedes like 10w40. 10w40 HDEO is typically synthetic, expensive and more common in Europe. Castrol offer 2x 10w40 HDEOs here, an E4 and an E6
 
I think there's an E6 Petro Canada version here in 10w-40, and maybe a couple other examples, but not a lot. I suppose in North America, 15w-40 has been traditional for OEMs with a 10w-30 winter option. Perhaps it's as much by convention as anything else. Similarly, we don't see a lot of 0w-40 or 0w-30 HDEOs with builder approvals, and sometimes they even lack API certification even when it's a reputable company. The builder approvals seem to focus on HDEOs in 15w-40, 10w-30, 5w-40, and 5w-30 viscosities.
 
Originally Posted By: FordCapriDriver
Most of the HDEO's you see are either 5W-40 synthetics or 15W-40 conventional oils , but i really could not name a single 10W-40 HDEO off the top of my head other than Shell Rimula R6, just curious.


I got to agree, for the same reason its so hard for me to find 20w50 (10/50 or 15/50) HEDO in the USA. I think maybe in Spain where you are, I may have better luck. I know in Europe and Asia I would, though I have a good 15/50 HEDO now, it would be nice to have more choices..

Yup ... its about demand.
 
Originally Posted By: Red91
I think I've seen Rotella T5 in 10W-40,once. I'd say it's demand. Same thing for 20W-50 HDEOs, no demand, although Citgo makes one, Citgard 500.


Ugh ... I was aware of the Citiguard 500 20w50 but NEVER could find anyplace in the USA that sold it.
I do use Mystik JT8 15w50 which is a Citgo product but would be interested to find the 500 in a 20w50.

(even though I have a 2 year+ supply of the Mystik :eek:)
 
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When SAE was adding HTHS viscosity there was much debate on what the value should be for 40 weight. The diesel OEMs wanted a higher value than the passenger car people. The debate was strong for both sides. The only way to settle the argument was to have a higher value for 15W-40 to please the diesel people and a lower value for 10W-40 to please the gasoline guys. Now we have two different groups of 40 weights. The ones that were originally meant for diesel engines one originally meant for gasoline engine. Thus diesel manufactures did not recommend 10W-40 or 5W-40 or 0W-40 and gas guys don't call for 15W-40 or 20W-40 or 25W-40. Look up SAE J-300.
 
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HTHS of Petro-Canada's 10W40 engine oils.

Supreme 3.9 (pcmo)SN
Duron E 4.3 CJ-4
XL CI-4 4.4
UHP E-6 4.1
Sentron 4.3 (CNG)

0W40 E 4.0
5W40 E 4.2 CJ-4
5W40 CI-4 4.3
 
Originally Posted By: DWC28
The high temperature viscosity is different for 10W-40 and 15W-40. Grades intended for diesel are 3.7 cP and grades intended for passenger car are 3.5 cP.


True, for the XXw40. For 10w30 it is also 3.5 for diesels. My reference, the 2016 Detroit Diesel Lubrication and Fuel Manual which even outlines specs for my 2000 Series 60 as well as the current crop of engines coming off the line. 3.7 min for 40w oils, 3.5 min for 30w oils.
 
Originally Posted By: DWC28
When SAE was adding HTHS viscosity there was much debate on what the value should be for 40 weight. The diesel OEMs wanted a higher value than the passenger car people. The debate was strong for both sides. The only way to settle the argument was to have a higher value for 15W-40 to please the diesel people and a lower value for 10W-40 to please the gasoline guys. Now we have two different groups of 40 weights. The ones that were originally meant for diesel engines one originally meant for gasoline engine. Thus diesel manufactures did not recommend 10W-40 or 5W-40 or 0W-40 and gas guys don't call for 15W-40 or 20W-40 or 25W-40. Look up SAE J-300.


The original inclusion of HTHS in J300 had 2.9 for the 0W/5W/10W-40s, and 3.7 for the 15Ws and up.

Apparently they had to drag the diesel engine manufacturers kicking and screaming in the day to go to multigrades, and the "natural" HTHS for an SAE 30 is around 3.5 anyway, so you can sort of infer where the mins came from...obviously a properly built 15W40 can seriously do better than that minimum.

There WERE M1 0W40 bottles down here labelled "energy conserving", a long long time ago, so presumably they were at the "30" end of the J300 40s back in the day.
 
Originally Posted By: supercity
Off the top of my head Scania and Mercedes like 10w40. 10w40 HDEO is typically synthetic, expensive and more common in Europe. Castrol offer 2x 10w40 HDEOs here, an E4 and an E6


Most went 5w30 LS these days.
 
Originally Posted By: Shannow
Originally Posted By: DWC28
When SAE was adding HTHS viscosity there was much debate on what the value should be for 40 weight. The diesel OEMs wanted a higher value than the passenger car people. The debate was strong for both sides. The only way to settle the argument was to have a higher value for 15W-40 to please the diesel people and a lower value for 10W-40 to please the gasoline guys. Now we have two different groups of 40 weights. The ones that were originally meant for diesel engines one originally meant for gasoline engine. Thus diesel manufactures did not recommend 10W-40 or 5W-40 or 0W-40 and gas guys don't call for 15W-40 or 20W-40 or 25W-40. Look up SAE J-300.


The original inclusion of HTHS in J300 had 2.9 for the 0W/5W/10W-40s, and 3.7 for the 15Ws and up.

Apparently they had to drag the diesel engine manufacturers kicking and screaming in the day to go to multigrades, and the "natural" HTHS for an SAE 30 is around 3.5 anyway, so you can sort of infer where the mins came from...obviously a properly built 15W40 can seriously do better than that minimum.

There WERE M1 0W40 bottles down here labelled "energy conserving", a long long time ago, so presumably they were at the "30" end of the J300 40s back in the day.


Well, some truth to the "kicking and screaming" thing regarding multi vis oil use recommendations by some diesel OEM's. But keep in mind, there were a LOT of 2 stroke diesels around, even up thru the 1980's. Those did require a straight weight oil in them, and still do for the few that are still around.
 
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