Review on Enhance Your Engine'S Performance With Rislone Hy-Per Lube HPL201 - 32 Oz,1 Quart by Steven Lewis

I put a bottle in my 200 Honda Accord V6, with 235,000 miles on the original engine, and yes, it had a noticeable affect, it was quieter, smoother, the engine on cold starts so much quieter and smoother too, had no effect on the VTECH system, 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.On all three cars, the gas mileage as increased, on average around 3 to 5 mpg.I know own a 2017 Kia optima, these engines are kinda noisy from new, it as 18,000 miles on it, so I thought, what the heck, next oil change, I will add this, you could hear the engine quieten down and smooth out before the bottle was empty, I always pour it into a warm running engine, stops oil pump shock.