There have been many tests and you can search them because a few have been brought over to the forum. For lubricity nobody is even close to opti-lube except biodiesel. The opti-lube outperforms everybody by such a large margin that I’m unsure why anybody would use any other product. I personally have used Diesel Kleen and 2 stroke oil but, will switch to opti-lube soon.
1)2% REG SoyPower biodiesel
HFRR 221, 415 micron improvement.
50:1 ratio of baseline fuel to 100% biodiesel
66.56 oz. of 100% biodiesel per 26 gallons of diesel fuel
Price: market value
Multi-purpose + anti-gel
cetane improver, demulsifier
HFRR 317, 319 micron improvement.
3)FPPF RV, Bus, SUV Diesel/Gas fuel treatment
Gas and Diesel
cetane improver, emulsifier
HFRR 439, 197 micron improvement
4)Opti-Lube Summer Blend
HFRR 447, 189 micron improvement
5)Opti-Lube Winter Blend
Muti-purpose + anti-gel
HFRR 461, 175 micron improvement
Check the link below post #5. This is just one independent study. I only copied the top five. TANK'S Library