10w-30 PCMO's vs. 10w-30 HDMO's?

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168
Location
KY
Well, I've had great results running various engines on 15w-40 HDMO's, either Delo, Delvac, or Rotella. Thing is. for most new gas cars and pickups, 15w-40 is not a recommended grade...usually either 5w-30 or 10w-30. I'd like to run what is recommended if I get a new car and pickup, and since the HDMO's come in a 10w-30 as well, how does it (the 10w-30 HDMO's) compare to say a 10w-30 PCMO, such as Castrol GTX or Chevron Supreme?
 
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