Mixing ATF in tranny

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Sep 18, 2005
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I have 2 quarts of Castrol Synthetic ATF. I was thinking of adding them to my transmission. I've been using Mobil 1 ATF for the longest. I usually drain and fill my transmission fluid 1-2x a year, so at this point, it is likely all Mobil 1 ATF. Would people not recommend mixing or would this be fine?
 
Most people only change out the filter and replace the oil 1x 2x in lifetime (if that)!!
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Why would you want to change away from Mobil synthetic?
 
guess I'm anal about changing fluids.
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I've also changed my differential gear oil twice already. Well, car is paid for and I want it running forever.
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I think you'll be fine mixing those ATF's. If they are differant spec's I would mix them is lower ratio's until you get the Castrol used up if you have a small sump. The larger the sump the higher the ratio can be without causing a problem. However, same spec. go for it.
 
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