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As Wild Dog said, you are just overthinking it. These cheap CG clones don't need or require anything high tech or fancy. They run them with what is often called Universal Oil, aka generic motor oil or diesel oil. As long as it either has the JASO MA1 or MA2 certification (Rotella T4 or T6) or is just a cheap basic oil with no friction modifiers (Wal Mart brand oil has been run by a few on here with success), then it will be more than adequate for a CG engine, which was designed to survive 3rd world countries and almost no real maintenance. The friction modifiers are the real issue. Additives like Molybdenum compounds (the most common) will cause the clutch friction to reduce to the point that it can slip while engaged and in gear. As long as the oil you use is clean and doesn't contain those modifiers, such as the basic diesel oils you mentioned, then it should be fine. Most generic diesel oils don't tend to contain friction modifiers.
If you plan on running your bike in colder climates, ie getting around freezing temps, then definitely drop down to even a 5 or 10 winter weight (5w or 10w). I usually run 15w40 synthetic in my bike pretty much from March to November, with the low temps in the low 40's without issue, but I also give my bike several minutes to warm up. I will sometimes switch to a 5w-40 during the colder parts of the year so the oil flows better when warming up.
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