Good info. I have been looking for a good source of ZDDP additive to use. Amazon always has deals but it is a little hard to tell exactly what you are getting. There is a Redline distributor that sells to the public in Englewood just a block or so from Sante Fe. It's where I get my MT90. They have everything Redline. I can't remember the name of the place though. It's a little hot rod speed shop too. I'll have to get some of that ZDDP additive there. $13 for a 16oz bottle isn't too bad IMO.
Sascha Steinway TLCA # 20217
1977 FJ40 "Ripper" (because it shreds!) (What is a "shread"...Steve Crase)
1988 FJ62 "Dino" OME, now in the hands of my daughter
2013 F-150 "Black Ops"