I was having issues with the Cruze at cold start up.By cold I mean ambient temperature(around 3 Celsius here now).The car would start and feel like it was running on 3 cylinders for a while.It would cough and sputter till warmed up (10 min. or so).I decided to try the Gunk product.I put 1/2 a liter in a half tank of fuel.Drove around for a couple of hours that day and next morning perfect start,no coughing,sputtering just smooth running.Big difference.I have 30,000 km,mostly city driving.I guess injectors do get gummed up,that's all I can think of as a cause. I use fuel from a good high traffic station so I assume the fuel should be ok.Anyway,I'll be doing this every so often.