The control arm kit comes with grease. Only use the supplied grease and nothing else. If you use other grease and or install grease fittings it will void the warranty.
In my experience the supplied grease with aftermarket control arms lasts for no more than a month or so before they start squeaking. The warranty wouldn't be much good in that case, so that is why I only use a grease that I don't have to reapply every 30 days.