Dex III or Dex VI in the tranny

[kennyk69]

I'd like to use the Dex IV as its synthetic.......what are you guys using? Any suggestions?

[UKandH]

My TS6 1:1 drive requires Mineral only...NO SYNTHETIC, it is written everywhere in the manuals and on the tranny. I also talked with a local dealer and he said to avoid synthetic on my transmission at all costs, it will cause slip and wear.

[michael hunter]

Dex III is what I use in all my boats

[jtryon]

DexIII only.