Red Line Friction Modifier & Break-In Additive 4oz - 12-Pack - Limited-Slip Diffs

Red Line Friction Modifier & Break-In Additive eliminates chatter in clutch-type limited-slip and posi-traction differentials and reduces break-in temperatures by as much as 50F. It is compatible with both petroleum and synthetic gear oils. This listing is a 12-pack of 4oz bottles.

Specifications

Directions

Add 1oz at a time to clutch-type limited-slip or posi-traction units until chatter is eliminated.

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy