STP's Synthetic Engine Oil Line-Up: Cleans Pistons?

[BIGROCCO]

Yeah...I think you guys are right...it was ARCO graphite...there was also an STP oil back in those days also that had some claim to fame, but I obviously don't remember anymore what it was. Thanks for correcting me!

 

[jmo42]

There’s an interesting thread from 2010 here on ARCO graphite:

and why? didn't work? or didn't sell? I know it was black....
Thanks Alex

https://bobistheoilguy.com/forums/threads/what-happened-to-arco-graphite-motor-oil.131066/