In another thread on engine oil, I mentioned that I purchased a 2011 Rav4 with 175k miles. I assume that its transmission fluids and other fluids have not been replaced.
My mechanic (extremely reliable and honest), says transmission fluid flush is unnecessary, and moreover dangerous. His argument is that with high miles, and lot of gunk and debris is in between the gear cogs, and it is this debris that is holding the gear together. If the transmission is flushed, he claims that with the debris gone, the gears could start slipping. He just advocates topping up transmission fluid periodically.
1. Should I go with my mechanic and just top up the fluid
2. Do a fluid exchange
3. or Do a transmission flush
For options 2 or 3, I will have to sneak off to another mechanic or chain-shop.
Also, what about other fluids such as differential and engine coolant? My mechanic says to just top them up.
Thank you in advance.