trans fluid change

I have a 1998 Buick Century Custom with 220,000 miles. I bought it with 207,000 so I don’t know if/when the transmission has been serviced. 1 week ago on my way home from work, my check engine light came on. I ran the code with the fixD scanner I have and it says the code is p1870...

I just bought an 02 Lesabre. The car has 103k miles. No maintenance records. Just pulled the transmission fluid dipstick, warm. No leak but the color on a towel is attached. Based on how it looks, do you think it was changed recently? Should I change it? What are the risks of changing (via...

I just bought a 2002 Lesabre and want to change the trans fluid, it calls for Dexron 3. The flid is dark in color and has a burnt smell to it. What is the best fluid for this vehicle? Since I am just dropping the pan, changing the filter and gasket will using a synthetic fluid damage the trans...