Pennzoil DEXRON-III MERCON is a petroleum based fluid for automatic and powershift transmissions. It is fully qualified as both a DEXRON-III and MERCON lubricant and meets General Motors specification 6417-M and Ford specification M2C185A. Also approved Allison C-4 fluid and is qualified as a Caterpillar/To-2 lubricant. Formulated specially for anti-shudder by allowing electronically controlled torque converter clutches to operate shudder-free. With a high-viscosity index that helps it keep its body, this fluid assures rapid flow throughout the transmission and helps prevent wear on moving parts.