Question: Helo Guys,

I want to know your experience about carbon material and grease
Can I use normal grease with carbon ? 
I want to put grease onto fork and stem....

Or WD-40 or silicone penetrant would be ok ?
Thank you....

Can I use this one ?
![http://i129.photobucket.com/albums/p231/picture_77/13012012170.jpg](https://i.stack.imgur.com/QhpnC.jpg)

Answer: 
Most automotive use grease is too thick for bicycle applications. It will lubricate, but it will add friction to the movement of the bike. 

Aside from the "weight" of the grease, you only need to worry about purity.

Phil Wood, of Phil Wood Components, used to say that his most important criteria for his bicycle grease was too make sure it matched the color of his original green sample. If it varied, even a little, he was besieged by inquiries about what he'd changed in his "formula".
i would be careful of any type of grease i use on a bike.. Grease attracts the dirt and can lead to further issues on the mechanics of your bike. like stated before - use an oil specially formulated for your bike. and make sure after every cycle to clean your bike down and re-oil.