Hello, I just bought a 2009 Civic EX, Auto trans, 125k miles, owner says he's kept up with ''preventative and regular maintenance" what ever that means exactly, when I asked him about if the transmission fluid he thought it was a sealed unit and said it doesn't need to be changed, I then found the dipstick and he then said he thinks it's been done. Chances are it has not. Soo at 125k miles should I do possibly the first fluid change? Or could it be too late and cause slippage or other problems? And also does the timing chain, guides or tensioner need to be replaced in the 1.8L?