Oh, hey, thanks Gary! you da man.
Here's the only info I got directly from STP:
"July 13, 2009
Thank you for contacting us about your STP Oil Treatment. We always appreciate hearing from our consumers.
We sold our filter division many years ago to Champion Laboratories. You may contact them for technical information at 1-800-882-0890.
Unfortunately, the amount of ZDDP in both of our oil treatments is proprietary. However, what I can tell you is that the amount in both the red bottle and blue bottle are similar. If you add either product to four or five quarts of oil, it will provide you with the same protection the older motor oils once provided. I hope this helps you.
Again, thank you for contacting us.
Sincerely,
Patti Copper
Consumer Response Representative
Consumer Services"