Does anyone have any experience with Globe impellers in their engine? The company claims that they are guaranteed to run dry for 15 minutes. The ad claims that Globe impellers are made of elastomer compounds, developed for optimum performance and self lubricating for run-dry protection, and that they have greater resistance to sand and dirt abrasion. These impellers are made from elastomers giving them the combined characteristics and multiple properties of rubber, nitrile, viton and neoprene.