Which types of equipment components should always use genuine parts?

High-stress, high-consequence components such as hydraulic seals, piston cups, engine internals, and safety-critical parts like brakes and emergency stops should generally use genuine parts, since failures here are costly and sometimes dangerous. These parts operate under constant pressure, heat, or load cycling where small tolerance deviations cause disproportionate wear. Lower-stress consumables can sometimes tolerate a well-sourced aftermarket alternative. Sparkline Group recommends a risk-based approach rather than a blanket rule, prioritizing genuine parts where the operating stress justifies it.