Recently, after a periodic servicing visit for my car (which has a multi point fuel injection system), the mechanic handed me BG Fuel Injection System Cleaner Part No. 210 and asked me to put it in the car engine after filling the tank half full. I am not sure as to wether to put the cleaner fluid in the Gas Tank or the Oil Filter. BG's own site states that "This product is designed to be used with the BG 9210 Inject-A-Flush® Apparatus and BG 44K® Part No. 208." I neither have the BG 9210 apparatus nor the BG44k. Please suggest.