Red Line Engine Break-In Oil Additive

Redline 75W90 GL-5 Gear Oil is Redline's most popular Red Line gear oil, with thousands of applications for passenger cars, light trucks, and racing vehicles

Contains additional friction modifiers for suitablity with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required.

This product is not designed for use in most manual transmissions or tranaxles, since the extreme slipperiness may cause synchronizer mesh issues that lead to shifting problems.

Recommended for API GL-5, GL-6, MT-1, MIL-L-2105E, and SAE J2360.


Red Line Synthetic Oil began creating lubricants for the racing industry. Today, we manufacture more than 100 quality products, including motor oils, gear oils, assembly lubes, fuel additives and our popular WaterWetter cooling additive for the automotive, motorcycle, marine and industrial markets.

Redline Engine Oil Brake-In Additive

Provides conventional motor oils with antiwear additives like zinc and phosphorus (ZDDP) necessary to protect against camshaft and valvetrain damage on break-in

Allow pistons rings to seat properly with less-slick oil, while antiwear additives protect other engines components to avoid excessive wear

Can also be used in conventional and synthetic oils during regular operation, providing an extra package of protection otherwise not found in most motor oils

16oz bottle treats up to 12 quarts of motor oil--in many cases, one bottle can serve two engines or oil changes


Bottle (16oz) contains:

  • 33.8 grams total ZDDP (zinc dialkyldithiophosphate)
  • 17,000 ppm, 7.8 grams Phosphorus (P)
  • 20,500 ppm, 9.4 grams Zinc (Zn)
  • 16.6 grams Sulphur (S)

Increases of antiwear per quart by using one bottle (16oz.): Oil capacity: 

Phosphorus Zinc

  • 15 quarts 610 ppm 736 ppm
  • 12 quarts 763 ppm 920 ppm
  • 10 quarts 915 ppm 1104 ppm
  • 8 quarts 1145 ppm 1380 ppm
  • 7 quarts 1307 ppm 1577 ppm
  • 6 quarts 1525 ppm 1840 ppm
  • 5 quarts 1830 ppm 2208 ppm
  • 4 quarts 2288 ppm 2760 ppm
  • 1 quart 9160 ppm 11040 ppm

Half Bottle (8oz.) When Treating:

  • 12 quarts 382 ppm 460 ppm
  • 10 quarts 458 ppm 552 ppm
  • 8 quarts 572 ppm 690 ppm
  • 6 quarts 763 ppm 920 ppm
  • 5 quarts 915 ppm 1104 ppm
  • 4 quarts 1145 ppm 1380 ppm

warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to

More Information
SKU 81403
Product Type Maintenance and Accessories
Maintenance and Accessories Engine Fluid
Brand Redline
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