Wondering if anyone has used NLGI#0 grease for hubs and what your experience was with it. I am also wondering if anyone had any success with thinning general purpose grease with something like synthetic motor oil or with mineral oil.
Thank you

Why? I repack hubs with marine trailer bearing grease which is NLGI 2.
I like to let the petroleum grease engineers design their product for an application rather than make my own.

I've used "0" and "00" corn head grease in vintage car/tractor steering boxes that tend to leak.

I'm finding that there is not much info out there about what'
s best to use. It seems that for performance or racing, the high end expensive stuff, is not suppose to be too thick and heavy. Isn't NLGI 2 basically general purpose grease?I did not consider NLGI 00 because it may be to runny but I thought perhaps "0" or "1" may be good . compared to the dedicated performance stuff price wise these seem acceptable.

What I hear you saying is that you want to both maximise performance and economy. I see no reason not to try "0" on hubs as an experiment; however I doubt that you will find a significant real-world performance benefit.

I use NGLI 00 for my internally geared hub mechanisms; however I still pack the axle bearings with marine grade bearing grease.

My favorite trick is to use red Ford automatic transmission fluid on my chains & drivetrains. Between that & diesel fuel my bikes run slick as #$%&t !

https://cyclingtips.com/2016/05/fric...ring-friction/

I will let you know the result once I get the grease. Thank you

I suppose worrying about a fraction of a watt would be of concern for a racer. For all but those professionals racers or those who value de minimus speed advantage over preventative maintenance frequency and component life this may work for them.