Oh boy:
Sorry to hear the bad news. Hopefully the mixture did not mess up the tranny.
Now about the tranny cooler, I had one large size put in my Oldsmobile in series with the radiator. I was getting that at a bargain price from a friend so I decided to attach that one. Yes it worked well and tranny ran much smoother. Then again GM olds tranny are like best shifting ones in the industry.

You can try one but in my opinion what prevents the radiator from going bad at other places. So why take a chance. I would put a new radiator and a midium size tranny cooler -IF YOUR TRANNY HAS A PROBLEM OF RUNNING HOT. Otherwise just a new radiator should be fine.

MVK

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One penny saved is three penny earned.

1985 300D Turbo 179,000miles