I put a bottle in my 200 Honda Accord V6, with 235,000 miles on the original engine, and yes, it had a noticeable effect, it was quieter, smoother, the engine on cold starts so much quieter and smoother too, had no effect on the VTECH system, the thing would still haul up to the speed limiter, So I then put a bottle in 1997 Suzuki sidekick, same again so much smoother, and same again, cold starts are so smoother.

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