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RED LINE Limited-Slip Differential Friction Modifier / Break-in Additive

RED LINE Limited-Slip Differential Friction Modifier / Break-in Additive


REDLINE Limited-Slip Diff Add. - 0.118L (4 Fluid Ounces) Bottle

0.118L (4 Fluid Ounces) Bottle


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

RED LINE Limited-Slip Differential Friction Modifier / Break-in Additive

Red Line Limited Slip Friction Modifier will significantly reduce the friction break-in of differentials, reducing break-in temps to as much as 50 degrees F.

Limited slip or posi-traction units will often chatter without use of this product or a gear oil with a similar modifier, so add only enough to eliminate the chatter and avoid making the plates or clutches too slippery.

Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


Provides the greatest gear protection available
Reduces differential and gearbox temperatures
Increases differential and gearbox durability
Rapid lubrication even in very cold weather
Improves shifting in manual transmissions
Provides improved drivetrain efficiency
Prevents foaming even at high speeds
Low corrosiveness reduces synchronizer wear
Stable even at elevated temperatures
Can be used in limited-slip and regular differentials
Suitable for competition and street use
Compatible with petroleum and other synthetics
Compatible with seals designed for petroleum
Satisfies requirements calling for API GL-5 and GL-6
Allows extended drains in non-warranty vehicles


  • Specifications
    • Exceeds API GL-5 specifications


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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