Originally Posted By: jtaylor
I had D4 in there already for 10-15k, definitely much better than stock. If it makes you more comfortable, doing a single drain and fill with Type F first is the safest thing to do! If you wanted to do a second drain and fill with type f you should only see benefits!
Did you consider redline high-temp ATF? It has all friction modifiers of D4 but higher viscosity. I use it in my toyota echo with great results