I bought the AT dipstick and after several checks the AT level seems too high. I checked it after driving the car for about 20 min., the AT fluid seems very warm so I suppose it was close to 80 degree. Couple more questions though:

1. Do you suppose to check the AT fluid when the engine is off or still running? I did it when it was off.
2. What would be the negative effect of having too much AT fluid?

Thanks,
JeffreyP