I believe I have found out that Quicksilver is made by Citgo. Please correct me if I'm wrong. In researching the Citgo 2 cycle Marine oil, it says:
CITGO SUPERGARD Marine Plus Two-Cycle Engine Oil is recommended for all water-cooled or
liquid-cooled two-cycle engines requiring an NMMA TC-W3, TC-WII® or TC-W® type oil. It may also be
used in many air-cooled two-cycle engine applications requiring API Service Category TC.
This stuff is like $12 a gallon!
Again, I'm not argueing, suggesting or anything... just getting very confused by these statements I'm finding about the lesser priced 2 stroke oils labeled tcw3.....