Good point Tyler. It claims to have 2x the cleaning agents of a tank of premium. It may become too strong for the good of the car or may work brilliant. An alternative is use with 91, fill next time with 91, then use 98. Or vice versa, use 98 only as a starter, use 91 then 91 with the STP.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
