Inquiry (采购产品): Kreen Do you add Kreen to fresh oil or do you add it first to your old oil? If the engine is full of old oil, do you drain some of the oil out and replace that amount with Kreen or do you just add it to the existing oil level (overfill)? **** Hidden Message ***** Gary Havey 62711 Company: Crime lab E-mail: glmahavey@comcast.net **** Hidden Message ***** glmahavey@comcast.net
