Hello there Scotty,

I want to use lacquer thinner for my cat in my 2006 Infiniti FX45 but its winter here where i live and i was wondering if it ll freeze or if anything will happen because its winter and also honestly is lacquer thinner even ok for my vehicle like won't it melt o-rings or seals or gaskets or any plastic parts or anything like that in my vehicle? Please get back to me ASAP as I really need to fix this problem?

it won't freeze, it has a lower freezing point than gasoline. As long as you put one gallon mixed in the tank with at least 9 gallons of gasoline, it's fine

I read online that the lacquer thinner will wreck fuel lines and even the engine. Is this true also if its not true can you guarantee that it will be harmless?