just to add one more tip, since everyone is trying different brands of grips:
I got this one while I was working on bicycles pretty regularly. If the grip wont slide on with whatever lube you choose, try compressed air. Just start the grip onto the bar, then hold the air nozzle tip right against where the bar and grip meet. Open the nozzle while pushing the grip on. It will almost scare you how fast it will slide all the way on. Basically the air gets between the grip and the bar like under a hovercraft and makes install a snap.