Current mileage????
Plan on a petroleum fluid change, or Synthetic?????
The W58 uses a GL4 or GL5 spec fluid.
Synthetic.... Redline Fluids are on our recommendation list (along w/ Amsoil, but I'm not as familiar w/ their products).
If you are under 100K miles, then you use the Redline MTL fluid. If above 100K miles, then go w/ the Redline MT-90.