Greetings Scotty/Community,

I recently bought a 2013 Toyota Camry with just 52,000 miles from the original owner. As I couldn't be sure about the actual state of the car I brought it to the dealership, my plan was to receive a complete service and a quick diagnostic from the "experts" and then never step on the place ever again. They saw some moisture between the engine and transmission that should be inspected in detail. Worried that this could be a transmission fluid leak and specially worried about a low fluid level I made a first change at home, 2 quarts came out from the pan which seemed correct based on some DIY videos but I also notice the fluid was quite brownish for the millage.

I decided to take the car to the dealership again for a transmission fluid change service, this way I could at least be sure the level was the correct and perform a reverse engineering at home to check how much fluid should come out from the transmission and make a constant check on the level. Luckily they told me the leak was coming from the engine seal to the transmission (my personal mechanic will take care of that soon), unfortunately they refused to change the fluid because of how dirty it was, I guess they are trying to protect themselves. The dealer suggested to look for a good mechanic outside and do some transmission fluid changes of 2 quarts each, test the car shifts between each change and stop when it takes longer to shift to the next gear. According to their records, the last time the car touched the dealership was in 2018 for a 60,000 miles service because of the time rather than the mileage.

The car is working fine and despite some scratches and OBDII codes everything is in great shape.

Codes

C1241 Low or High Power Supply Voltage
C1201 Check report for description.
C1237 Speed Sensor Rotor Faulty
C1467 Rear Speed Sensor LH Circuit
C1466 Rear Speed Sensor RH Circuit
B1660 P Seat Airbag Active Mode Indicator
U0129 Lost Communication With Brake System Control Module
B1442 Air Inlet Damper Control Servo Motor
B14B2 Lost Communication with Front Panel LIN
U0073 Control Module Communication Bus "A" Off
B15FE XM Tuner Antenna Disconnected
B1579 Voice Recognition Microphone Disconnected
B15C1 GPS Antenna Disconnected (Open)
B157E Bluetooth Antenna Disconnected
P1604 Startability Malfunction
U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module

Can the fluid get that dirty with so low mileage? Should I change it the way the dealer suggested or think about selling it?

Thanks in advance,