OTC P-0716-UV UltraTraceUV Dye Smoke Solution UltraTraceUV & trade; dye solution is the only solution approved by GM, Ford, and Chrysler It will not harm the activated charcoal canister, ORVR valve, purge valve, vent valve, catalytic converters, O2 sensors, seals, or gaskets UltraTraceUV dye will not void factory warranty