Went to walmart and they started carrying this and 0w-20 Synpower. Has anyone ever used the European formula? What type of add pack does it use? Similar to the regular Synpower? Thinking about trying it one OCI once my Eco is out of warranty to see if it will help with the fuel dilution and wear so I can extend my oci. That will be quite awhile yet. Don't care about the minimal fuel economy difference.