When buying hdeo 20w50

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Are there some brands that aren't HDEO? Or are all 20w50 apart of the hdeo family?

I know 15w40 has a strong additive pack ( usually) but I've never paid attention to 20w50.
 

Does this count? This stuff is dual rated and is under amsoils diesel engine oil line on the website
 
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Petrol a.k.a (rebranded) Havoline/Texaco...

extra_20w_50.jpg
 
Even now, in parts of the developing world, the two primary oil grades are 15W40 & 20W50. I would say that PCMO can be either whereas HDDO might usually be 15W40, but not exclusively. In these regions you might also find 20W40 oils which in my experience make stunningly good HDDOs.
 
older engines of any type can benefit from a higher viscosity @ running temps to compensate for lost oil pressure due to wider worn clearances. early poorly made HD motorcycle engines needed straight 50 + 60 weight oils + still leaked like a siv!!!
 
Shell makes i think 2 20W-50 HDEO's, Rimula R3-X and R2 Extra, both diesel only rated, no gasoline engine ratings, 20W-50 is rare among HDEOs.
I've seen all these viscosities of HDEO :
5W-30
10W-30
15W-30
SAE 30
SAE 40
SAE 50
5W-40
10W-40
15W-40
20W-40
20W-50
 
The Mystik 15W-50 is semi-synthetic, relatively inexpensive, and works GREAT in Harley Davidson engines.
 
Except for the few mentioned here. 20W50 HEDO is almost impossible to find in the USA, yet is readily available throughout the rest of the world. Frustrating for sure.

Only ones I know of are the two mentioned here, Mystik JT8 (15/50 semi syn) and Amsoil (20w50 syn).
 
I just cleaned off the shelf at Walmart of 20W50 Castrol motorcycle oil on 1/2 price. I'll try it out in my LML Duramax next summer. Petro-Canada just rolled out 2 Duron 20W50s and 15W40s; Classic GH-4 and Extra CJ-4.
 
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