Fuel system cleaners are fine for your engine, some work and some don't
We use Wurth in our workshop at the moment but have used Innotec and Forte previously with very good results. Modern fuels, especially in the UK, leave gums and varnishes in the fuel system so a periodic cleanse does them good. You notice the effects of fuel system residues more with carburettor engines as they have no sensors or ECU to adjust settings automatically so they manifest a noticable problem faster. We use them at every service in car we maintain and in 30 years we have never replaced an injector, we have only replaced injectors on cars that are not serviced by us. It will not damage your engine.
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