I wouldn't say there's a professional Grand Prix Mechanic lol. Try it out and tell us how it feels...I bet you'll notice a difference. So called mechanics don't know everything just because they work on so and so and have so and so experience doesn't mean everything and books cant teach you everything...food for thought. Something's you gotta try yourself.

Yes they make quite but of difference with a hour of your time and the cost of WD40.