Fat Cat tuning slide grease: is quite different in its chemical makeup. It is synthetic grease for a specific reason: Petroleum greases, which are basically anhydrous lanolin or a heavy oil with a lithium soap filler, work well for tuning slides but each tends to melt when warm, or when mixed with valve oil. So as water and oil from your pistons and rotors seep into the tuning slides, it dissolves an organic grease and later may re-enter your valves, making them dirty and sluggish. Fat Cat Synthetic Tuning Slide Grease is resistant to heat (you can't melt it on the stove.) and more important, resistant to mixing with petroleum valve oil and water. With this combination of Fat Cat Oil and Fat Cat Grease, you will notice that your maintenance schedule of re-greasing and re-oiling is now greatly extended.