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Complete Engine and Gearbox Maintenance with Additives

Model: Smart Smart 451 - Years 2007-2015
Part: Checks and maintenance

The video shows a bench test to measure power and torque before maintenance: the aim is to demonstrate how the use of certain additives can improve engine performance by restoring its proper functionality.
Before draining the engine oil, add the internal cleaning additive and run the engine for a while; also add the fuel cleaning additive and start maintenance by replacing the engine air filter. Then clean the throttle body with the appropriate spray; drain the engine oil and replace the oil filter cartridge; also drain the gearbox oil and add the appropriate oil with the corresponding additive: when the oil starts to flow from the fill plug, the level is correct. Replace the spark plugs as well. Add engine oil additive and then oil to the engine, checking the level. Clear the fault memory in the engine control unit and initialise the automatic gearbox. After maintenance, you will notice an improvement in cylinder compression as well as an increase in power and torque.

Updated on 8 February 2026 by ScegliAuto

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