Are you talking class action suit? I think you should file a complaint with the NHTSA (although I generally loath the entity). Save your money and let your dealer fix the problem. If the struts on your car are leaking, let them change them out for you.
Have you experienced any actual loss because of it? Wages, injuries etc. Without solid evidence of damage, it will be difficult to mount a suit. What would you sue for?
Im not a lawyer, just moderately informed. A suit would be a major pain in the backside. I would think that GM would be considering a campaign on this issue (recall) If enough of us report the problem. I am not certain that the leak is a safety issue, but it has not happened to my car (yet - I have the affected build date) It may affect the safety of the car, I just don't know.
Post your complaint on the NHTSA Website!