The new 30 weight Max Duty Super F is for large displacement, turbocharged or +2,000 HP engines - including off road use and monster truck use. 100% mPAO based synthetic, it features heavier viscosity for less thermal break down, cooler temps and better converter lock-up over our 20 weight Super F. Recommended for use in GM Powerglide, TH350, TH400, Chrysler TF727, TF904, Ford C4, C6 and other non-electronic transmissions.