I'm using Mobil 1 ATF. I rebuilt my trans a couple of years ago, and I'm a big fan of synthetic lubricants for the long haul. I understand there may have been a formulation change recently, and it may be less suitable than it once was. I think my Mobil 1 would be the older formula. You'd need to do a complete fluid change to use any synthetic effectively.

If you're not going the synthetic route, any good Dexron III fluid will be fine. I like Castrol products, Quaker State should be OK, too imo.

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1987 W201 190D