Generally my shop is 70-80 during the summer. A few days close to 100, but only a few. Some years none. That said, in the past I have used grease that leaked out the gun, as well as the tubes in the box, even in our cooler climate. To be clear, I agree your environment is more harsh as far as the storage temps. No doubt about it. That said, my equipment, even at the grease points, will far exceed your shop temp, while applying more force than the plunger on a grease gun. Hence, the comment about the better grease. Also, if you don't believe me, I'll send ya a tube or 2 at no charge, just to see if it handles the heat. Lastly, wanted to let ya know since it is at times hard to tell in print, I'm not try in to be a jerk here. Honestly wanting to give ya a fair comparison, so I do hope that's how this comes across