I've heard it works, but I dunno about putting it in my oil.. I've dont the engine top cleaner though (through vac line) a couple of times on my old celica and my bros truck.. it does seem to make it run better.. but probably all mental, haha
what color is your 91? grey? wanna sell it
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91 turbo - 2jz, aem, stock twins
91 turbo - 1.5jz t67 being peiced together
87 turbo - 7m hardtop