It has 208k miles and I'm getting it on the road for the first time since 99. I'm doing a trans filter change and I want to know what fluid I should get. I was at Advance Auto today and there are a LOT of options.

There's dexron and mercon and each has a myriad of variants. Then there is Mobil 1 and Pentosin synthetics. I do like the idea of synthetics if they are MB approved. I've found a few threads on the topic but not found a concensus.

I want to buy it tomorrow. Help!