6.5 RPM's and throttle erratic

[EppNation]

I know my IP is long in tooth (OLD), but I want to make it last. I've tried 2 stroke, Optilube, and ND-W30 (it's what works best for me).
I add 1 qt of ND-30 with each 20 gallons approximately, to replace the sulfur lube missing from ULSD.
I add +/- 6 oz of Diesel Kleen gray bottle at every fill up to keep the injectors happy.

What is ND-W30?

 

[hookedup50]

Non Detergent 30 weight

 

[dangerousdave]

Non Detergent 30 weight

Sorry, I should have explained. I get it at Walmart, it's the cheapest they have IIRC. Black plastic quart.
It's so cheap they don't even put it on their website. I tried the stuff from the dollar store once, never again. The viscosity and smell were like a bad omen.