Oil/Brake Fluid/Lubricant/Rust Remover

This is the practical chemistry that keeps things moving — and bolts coming loose. Engine and gearbox oils, brake fluids (DOT), greases (e.g., lithium, copper grease, silicone), plus rust removers and penetrating oils for seized fasteners. Pick by manufacturer spec: the wrong viscosity or wrong DOT isn’t “slightly worse” — it can cause real problems. The goal is simple: smoother operation, less wear, fewer noises, fewer broken bolts.