One thing I notice about Delo 5w30 though is that its additive levels are quite a bit lower than other HDEO oils marketed towards the truck market. It meets MB 229.51 spec for example which required Phosphorus to be under 0.08. Heck, it nearly meets the VW507.00 spec of 0.06. I'll let others chime in on the significance, but just wanted to point it out.
Here's a quick compare to Delo 5w40 full syn.
Delo 5w30
Sulfated Ash, wt %
1.00
Base Number, ASTM D2896
9.8
Phosphorus, wt %
0.07
Sulfur, wt %
0.27
Zinc, wt %
0.082
Delo 5w40
Sulfated Ash, wt %
1.0
Base Number, ASTM D2896
10.3
Phosphorus, wt %
0.114
Sulfur, wt %
0.29
Zinc, wt %
0.127
FYI - if you google Delo 5w30 LE UOA , apparently the Russians love it because there are several posted... lol.