I bought a used 2010 Corolla with an automatic this month. When I bought it the dealer showed me a carfax report showing multiple service entries from multiple dealers. I'm not sure if the fluid was ever changed. Is it a good idea to drain the pan and then put that much back in. I was planning on buying the fluid from the dealer. The service guy said if your not having problems I shouldn't touch it.
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Depends on the milage. If it's a high milage car, it might start slipping (if fluid was never changed). If it's under 150K you can try to just do a single drain & fill and save old fluid in case it starts slipping. Kind of a tossup at this point. How many miles do you have on this car?
89,000
Should be safe at this millage to do drain & fill. Save old fluid just in case, but I think you'll be OK.
@jvin you can't really add back the old fluid from a drain and fill. You take out 1/3 then add 1/3 new and it mixes. Once mixed, you can't change get the new back out, maybe 1/3 of it at best.
I agree that at that mileage, should be okay to change. That is the normal recommended mileage to change at.
@aldie You can sign up on the toyota owners website and enter the vin of your car. You will be able to see all the maintenance done at any toyota or Lexus Dealership.