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You might find this comparison helpful. https://www.jatonkam35s.com/DeuceTechnicalManuals/Diesel_fuel_additive_test.pdf

This sounds exactly like my experience. The engine sounds terrible then it just smooths out and sounds like a different engine. Here is a link to an article that explains what is going on better than I can. https://axi-international.com/ultra-low-sulfur-diesel-ulsd/ Glad to hear it worked for you.

I use it every tank at the higher rate they recommend. Something like 1 or 2 ounces per 10 gallons. The first tank full my mechanic told me to use it at 4 or 5 times the highest recommended rate.

I was also skeptical about lubrication since my skid steer ran perfectly for thousands of hours. Then one day it started surging like you described. After checking for air leaks and finding none. A mechanic listened to the machine idling and told me it would be solved with Opti-Lube and he was...

I had the same symptoms on my 1998 New Holland LX885 skid steer. It turned out to be caused by a lack of lubricity due to the low sulfur diesel fuel. I added Opti Lube and it solved the problem right away. I would try that first since it is cheap, easy and won't hurt anything.