null Skip to main content
  • truck icon

    Free Shipping!

  • star icon

    5000+ 5 star Ratings

  • clock icon

    Lowest Price Guarantee!

  • Money symbol

    Earn "Performance Points!"

SKU: RED-80301

Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz

$12.99

In Stock

SKU: RED-80301

Red Line Limited-Slip Friction Modifier/Break-In Additive

  • 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 positraction units to eliminate chatter

Additional Information

Limited-slip or Positraction units use plates or clutches to provide the proper amount of lock-up to the differential. Slippery lubricants are required to prevent chatter, but too much slipperiness causes excess wheel spin, reducing traction.

For perfect traction, use Red Line 75W90NS and add the Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive until the chatter disappears.

Recommended Dosage:

Use 4% for prevention of limited slip chatter in broken-in units (typical one 4 oz. bottle) or 4 to 8% for the break-in of new differentials.

Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive will significantly reduce the friction during break-in of differentials. High temperatures encountered in break-in can destroy the hardening of the gear teeth causing rapid wear of the softened gears. This additive can reduce the break-in temperatures by as much as 50°F, improving break-in conditions. Compatible with petroleum or synthetic gear oils. Red Line Gear Oils already contain this additive (except the NS).

In non limited-slip racing differentials and quick-change units using the Red Line ShockProof Gear Oils an additional 3 to 6% Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive is recommended.

About Red Line Gear Oil For Differentials

  • Full-synthetic formulas created from polyol ester base stocks, offer excellent lubrication under extreme conditions
  • High viscosity-index (VI) to provide relatively constant viscosity and film thickness with varying temperature change
  • Ester base stocks and friction modifiers provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears
  • Superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils
  • Exceed API GL-5 specifications
  • Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals and less wear

Recommended For:
Chrysler
4318060
Ford
M2C118-A
19B546-MA
GM
1052358
Most Imports

?Safety and Product Data Sheets

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

See More

Specification

Data about Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz

Description

Red Line Limited-Slip Friction Modifier/Break-In Additive

  • 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 positraction units to eliminate chatter

Additional Information

Limited-slip or Positraction units use plates or clutches to provide the proper amount of lock-up to the differential. Slippery lubricants are required to prevent chatter, but too much slipperiness causes excess wheel spin, reducing traction.

For perfect traction, use Red Line 75W90NS and add the Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive until the chatter disappears.

Recommended Dosage:

Use 4% for prevention of limited slip chatter in broken-in units (typical one 4 oz. bottle) or 4 to 8% for the break-in of new differentials.

Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive will significantly reduce the friction during break-in of differentials. High temperatures encountered in break-in can destroy the hardening of the gear teeth causing rapid wear of the softened gears. This additive can reduce the break-in temperatures by as much as 50°F, improving break-in conditions. Compatible with petroleum or synthetic gear oils. Red Line Gear Oils already contain this additive (except the NS).

In non limited-slip racing differentials and quick-change units using the Red Line ShockProof Gear Oils an additional 3 to 6% Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive is recommended.

About Red Line Gear Oil For Differentials

  • Full-synthetic formulas created from polyol ester base stocks, offer excellent lubrication under extreme conditions
  • High viscosity-index (VI) to provide relatively constant viscosity and film thickness with varying temperature change
  • Ester base stocks and friction modifiers provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears
  • Superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils
  • Exceed API GL-5 specifications
  • Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals and less wear

Recommended For:
Chrysler
4318060
Ford
M2C118-A
19B546-MA
GM
1052358
Most Imports

?Safety and Product Data Sheets

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

At a Glance

Brand Red Line
Part # / SKU RED-80301

Product Data Sheets

Downloads and manuals associated to Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz

Available Variants

Different variants associated to the Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz

  • $12.99

  • In Stock
SKU:
RED-80301
Product Description
Wholesale pricing available, learn more HERE
$12.99

In Stock

Adding to cart… The item has been added

Please login to save items.

Frequently Asked Questions

What vehicles is Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz compatible with?

Use the specifications and images on this page together with your vehicle details. Match part number RED-80301 to your existing component or OEM interchange.

Explore similar Fluids & Lubricants to find the right fit for your car, truck, SUV, or powersports vehicle. See more Red Line products we carry.

What is Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz used for?

Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz from Red Line is intended for normal automotive service and maintenance—such as brake pad and rotor service, oil and filter changes, or other listed applications—depending on how this SKU is categorized. Follow your owner’s manual and any torque or fluid specs printed on the packaging.

Discover complementary items in our Fluids & Lubricants collection and Additives.

Is this Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz an OEM or aftermarket part?

This listing is an aftermarket replacement manufactured or branded by Red Line, engineered to meet or exceed typical OEM performance for the applications described. It is not necessarily a dealer-original part unless the description states otherwise.

Compare alternatives in Fluids & Lubricants if you need a different formulation, kit, or price point.

What is included with Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz?

You receive the Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz (SKU / part number RED-80301) as shown in the photos and bullet points. Kits may include filters, gaskets, hardware, or fluids; single components include only that item. Open the Specifications and Includes areas on this page to confirm quantity and contents.

How do I install Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz?

Installation steps depend on the part type (for example, brake pads versus an oil change kit). Work on a cool vehicle, use proper jack stands and tools, torque fasteners to spec, and bed brakes or prime filters per the manufacturer’s instructions. If you are not experienced with suspension or brake work, use a licensed technician.

Find related service items in Fluids & Lubricants. You may also consider Red Line Engine Break-In Additive - 16 oz or Red Line Assembly Lube - 4 oz.

What warranty or return policy applies to Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz?

New, uninstalled items are generally eligible for return within the time window posted in our store policies, provided they are in resalable condition. Reference your order and SKU RED-80301 when contacting support. Defective or incorrect shipments should be reported promptly with photos when possible.

Need a different fitment? Browse Fluids & Lubricants for other compatible options.

How long does shipping take and when will Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz be available?

Many in-stock orders ship the same business day when placed before the warehouse cutoff. Transit usually takes about 2–5 business days in the contiguous U.S., depending on carrier and destination. Availability is shown near the add-to-cart button on this page.

Shop additional in-stock choices in Fluids & Lubricants.

How do I double-check that this part fits my vehicle?

Cross-check year, make, model, engine, and trim with the fitment data on this page, your old part number, and SKU RED-80301. When in doubt, verify with a dealer parts catalog or qualified mechanic before opening packaging.

Similar listings: Red Line Engine Break-In Additive - 16 oz and Red Line Assembly Lube - 4 oz. Explore the full Fluids & Lubricants category for oil change kits, brake parts, filters, and more.

YOU MAY BE INTERESTED IN

Products related to the Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz and included in the Fluids & Lubricants category

Accessories

Frequently bought products with Red Line Limited-Slip Friction Modifier / Break-In Additive - 4 oz

!

Select Vehicle

Let us know the make, year, model and engine your searching for parts for. We’ll use this to ensure we only show items that fit your vehicle.