hey guys i would like to add some chevron pro-gard fuel injector cleaner to my 98 540i bimmer i have 60k, have any one use this product before p.s takes for help

I have added it before but I can't tell if it made a difference. I just used it before my smog check

by the way this is not even close to the right forum to be posting a question like this. if you have maitenence questions there is a section for it, or if your asking questions related to your 5 series, then there is a section for that too.

your in the track and autocross section. :P