Hi

I have a Honda Civic 2001 and if you search online this car has too many problems with transmission. Luckily my car is working just perfect. It has 108663 miles on it. I don't remember ever some one changed its transmission fluid. I checked it was OK and was dark brown. I asked the Honda tek if I need to change it he said OK we can do it but before a pep boy rep told me you don't need to as the oil has never been changed before. If you change it will cause problems.
Now I have two options change it or not. If change will I get in trouble ?

PepBoys are wrong; 100K on transmission fluid is too long, especially if it's dark brown. Have the filter serviced too, if possible(not all cars have a changeable filter).

Change it ASAP. It should be done every 30,000 miles or two years, whichever comes first. I would use Mobil 1 Synthetic ATF.

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563.html#post219991

There's no filter in your Civic. Easy job for a do-it-yourselfer.

You should follow the recommended transmission fluid change interval (for automatics) at 120K miles or 6 yrs whichever comes first. In severe operating conditions (i.e. operating in dusty areas, towing a trailer, idle for extended perios or low speed operation, trips of less then 5 miles and operating below freezing temps) fluid must be replaced every 30K miles.

Unfortunately Honda Civics 2001 have a torque converter that fails prematurely due to inferior clutch plate material. When the internal components shatters, the debri flows into the transmission and clogs the filter. This will cause a slip condition on all gears thus rendering the vehicle from moving. Most often, the vehicle will move when it is cold, but then within 5 -8 miles, the filter will clog up again and prevents proper fluid distribution.

The ideal and most practical solution to prevent this occurrence is to replace the torque converter before it hits the 100K mile mark. A new or rebuilt part will contain the improved version of the clutch plate material.

Change it. Transmission fluid is red. If it is brown, it is no good anymore.