thanks for the info, It's not the first time i have changed it, it will be the first time for me to change it, i had an extended warantee on the car up to 85K so before that the dealer changed it. I plan on changing it every 20K miles as some of the members have stated as a good interval. thanks Ken

If you are only going to change your tranny fluid every 100,000 miles I would spend the extra bucks and go for Mobil 1.

Personally I think that changing ATF at 100,000 miles is way too long for regular dino ATF. I'll bet you anything that you WILL notice a dramatic change in the way your transmission shifts after you change the fluid.

If you are definitely going to stay with Dino ATF then i would say that Castrol is probably as good as any of them. Remember, Most mechanics use only 1 brand because that is who they do business with and they get a break for only using that brand. It's pretty rare to see someone actually offer you a choice of using either Castrol or Penzoil or Brand XYZ oil. Usually it's only one choice.
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Nathan Valles, Black 855R, Tint

There is Mobil 1 ATF, Amsoil and Castrol Synthec. There was a post not too long time ago that claimed that Castrol Synthec (motor oil) is not a synthetic oil. I don't know if that applies to Castrol ATF too and neither I care as I use Mobil 1 ATF and motor oil.

Ken,

I don't change my own oil/tranny fluid, but recently purchased a '95 850T and the original owner always used CASTROL. My mechanic just happens to use ONLY CASTROL products and I continue to do so

FYI, Castrol was recently picked by VOLVO, JAG, LANDROVER, ok Ford as the oil/fluid that is used when these autos roll off the assembly line.