Automatic Transmission - Drain or Flush when Brown?

DamionG1

Wrench Pro
Points
43
Location
Trinidad
Car
Nissan Sunny B15
Hi. I would like to know which is better for a 18 year old Automatic Transmission fluid changeout. i recently inherited the car and i have no idea on when last the fluid was changed. it is brownish red in color currently, no problems with it and its not slugish, slipping or anything. i just think it needs to be changed as with any engine fliud when its time or km mark has come. Any suggestions? thanks
 
Always flush through IMO, it's not worth the risk. Most mechanics will just drain and refill though. Warm up the transmission before the drain and it'll flow out much better.
 

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