Originally Posted By: used_0il
Its no secret that I use Petro-Can products, which includes their OG-0 and OG-1
grease.
They have an OG heavy that has a significantly higher base oil than the others.
This is not a plug for any one brand that offers the same performance, but I'm
considering the above for down hill mountain bikes and bicycle wheel bearings.
The water resistance and water reversibility of that type of grease is attractive.
Would the grease with the higher base oil viscosity be an advantage over the same
grade (2) than the same grease formulated with a lower viscosity base oil grade?
Just to avoid some misconceptions – grease is oil with thickener and not other way around. For most greases greases the thickener is like sponge. Calcium sulfonate greases are exception. The thinkenenr is AW and EP additive.
I would recommend you to select grease following this.
http://www.machinerylubrication.com/Read/798/grease-selection
Personly a switched few of our bikes to calcium sulfone grease – in my case Total ceran WR2.
I have little experience – only few mothns in the dry sommer period. In general it seems to be a grease stuff in most area, but want to have the low temperature performance of Synthetics Li-complex greases – e.g. Mobil SHC 100, 220
Next year April/May will make a report about using Total ceran WR2 instead of Mobil SHC 100 and 220 on our bikes.
Back to your question – whatever the grease is ,I will never go bellow ISO 100 base oil. ISO 220 is just great for most bicycle applications. I like NLGI2 for bearing because it make nice channel on it. Don’t be shy to use heavy greases. Bottom bracket, pedals and hubs consumes just 4 wats by 20mph flat ride – 200..250W. Good tires and well maintained drivetrain is more important.