Heavy-duty, soy-based metalworking fluids are formulated with a Desilube-proprietary EP package. These fluids perform in the same fashion as conventional straight oils. They exhibit comparable lubricating performance but different viscosities (10 to 120 cStc at 40°C). These fluids are recommended for use in various heavy duty metalworking operations including cutting, grinding, sawing, deep drawing, broaching and fineblanking. These fluids are extremely effective with respect to improving tool life in mist or near-dry metalworking operations.