Overview Reviews Product Description Compatible with both petroleum and synthetic gear oils Reduces break-in temps as much as 50°F Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter Product Videos Custom Field Product Reviews Write a Review Write a Review × Red Line Red Line Limited-Slip Friction Modifier & Break-In Additive 4 oz - 80301 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *