Greasing Z screw?

i thought its not good to use grease that has a petroleum base with anything that has rubbers or plastics in contact with it? i can see my one has some white grease that has a light viscosity compared to car wheel bearing grease so i think it might be silicone grease?
 
Used all of them and all work fine - lithium grease and superlube have used for about four years. Other point is I really wouldn't worry too much, need a tiny amount incredibly rarely (eg I've got a MK3S that I've had for about 5 years and has been in almost daily use, but greased once - still prints like a champ)
 
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