Are additives good for petrol vehicles?

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Fuel additives all Red Line fuel additives are comprised of the best chemistry for cleaning and preventing corrosion in fuel systems. They are

Red Line (60103 Complete SI-1 Fuel System Cleaner - Gas and Injector Additive Treatment - 15 Oz Bottle

Engine and fuel additives explained - Classics World

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Fuel additives: Just a gimmick or does your car really need them?

Will using too much gasoline additives hurt your car's engine? Are there any alternatives to additives that work just as well (fuel injection cleaners)? - Quora

Do Oil and Fuel Additives Really Work? - Europa Parts Blog

I'm a famous mechanic - you're wasting £50 buying 'pointless' accessory for your car it's a complete rip off

Fuel System & Fuel Additives, Basic Maintenance