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Complete Engine and Gearbox Maintenance

Model: Smart Smart 450 - Years 1998-2007
Part: Checks and maintenance

In this specific case, the video demonstrates the effectiveness of using nanotechnology additives to maintain the efficiency of the engine, gearbox, and fuel system; a bench test shows an increase in power and torque. Before changing the engine oil, add an engine cleaning additive and let it run at idle for at least 15 minutes; then proceed with the oil change (again adding a maintenance additive) and the filter cartridge. Next, replace the gearbox oil, also adding a maintenance additive. Finally, clean the throttle body with the appropriate spray and add a fuel system cleaning additive to the tank.

Updated on 7 February 2026 by ScegliAuto

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How to Open the Fuel Cap of the Volkswagen Jetta

When you need to refuel this vehicle, first open the fuel filler flap. Follow these simple instructions, and you can also watch the video for more details. First, unlock the central locking to open the flaps. Then, press the fuel cap with your hand to unlock it and open it. Underneath, you will find the fuel cap, which you need to unscrew counterclockwise. At this point, you can proceed to refuel.

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