Grease for bolts?

I've used Lucas Wheel Bearing grease. Works well enough and is pretty thick so only a small layer is needed and it doesn't rub off too easily either.

liquid wrench White lithium grease, comes in an aerosol can. Doesn't attract too much dirt if you don't over use it. I use it inside the cylinder too.

Another thread about lube. I have been using white lithium grease, but instead of a spray I have been using the paste stuff. On the side it says it contains petroleum oil but I tested it on an old bucking for a few weeks and the petroleum oil didn't do any damage to it.

If you have to have silicon then get silicon grease, not oil. Oil attracts too much dirt and the grease has a higher viscosity.