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The cost will depend on if you go to a locksmith or dealer and how old the car is. You can read more about how to replace your car keys here.
You can use 91-octane unleaded petrol, but to get the best performance and lowest fuel consumption it’s recommended that you use 95-octane Premium unleaded.
Were you told why the first engine failed? It’s most unusual for an engine to fail at such low kilometres, and to have it happen again is unbelievable. If the engine has failed again and needs to be replaced Citroen should do it under warranty, which should still be current. If they don’t then go to the ACCC for help, or take your claim to VCAT.