Glad to hear you are replacing your coolant as this is often overlooked. Did mine when I purchased the Crossfire 5yrs ago. Are you doing this for preventative maintenance? Today's modern cars with their aluminum blocks and aluminum radiators, including the many plastic parts don't have the need to flush as in the past, but I continue to do it after significant mileage anyway. After the first 60k miles I would recommend to anyone to have their coolant drained and replaced....