Cold motors are hard to start due to the absence of oil. When the thermostat drops the oil congeals in the oil pan, kinda like the broth in a Pot Roast after being in the Fridge all night. This leaves metal against metal causing the engine to grid and drag. Once the motor starts the oil warms and is pumped over the moving parts. NanoSave N1 and NanoShield remain on the surface of moving parts no matter how cold the weather gets. NanoShield is a super slick film of Nano particles that keep the parts from grinding and allow for a quick cold start.