I have a tube of Phil Wood (the green kind) waterproof grease that I bought 6 years ago when I first started riding. I have used it to rebuild pedals (crank bros) grease threads, etc.

Now I have 3 cup & cone hubs to rebuild. I've pilot rebuilt one of them (to teach myself the process and how to adjust them just right) using this grease. Now I'll go in to rebuild these wheels with new balls and all, should I use this 6 year old grease or get a fresh tube? I haven't left the cap off etc, so by all appearances it looks like it did when I bought it.

TIA