MXP
Established
If you are talking about powdered lubricants, I'd advise you to NEVER use them, especially spray lubes (like WD-40). The only dry lubricant I have ever found that stays where you put it is graphite in stick form: http://www.heatoncooper.co.uk/eshop1/shopimages/products/normal/graphitefaberstick.jpg
They are sold in art supply stores and are used for drawing. Ask for a #6B. You rub it on and then wipe most of it off. Pretty much any other form of dry lubricant will wind up all over the inside of the camera.
I have also used some fine gun oil. It also seems to be ok. I got some form this supplier:
http://www.proshotproducts.com/
It seems to be a very fine oil. I would never use WD-40 and never graphite powder. The SuperLube dry-film is PTFE based. It is sold as spray. So I spray a bit into a little bottle and then use another method to apply it where I want. About the dry powder (which I don't think is graphite.....it is called Molylube) I have heard a good way is to dilute it into "lighter fluid" and use it this was as it was a normal fine oil. I will try it on a shutter I don't need.....just for an experiment.
SuperLube products are here:
http://www.super-lube.com/