Red Line 80W140 Gear Oil - Fully Synthetic, Heavy Duty, Manual Transmission, Differential

Red Line 80W140 synthetic gear oil is designed for heavy-duty and high-temperature non-synchromesh...

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eBayRed Line 80W140 GL-5 Gear Oil 58104 Fully Synthetic Gear Oil - 1 US Quart 946 ml
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Product Information

Full details

The Red Line 80W140 synthetic gear oil is for owners of heavy-duty, high-temperature manual transmissions and differentials, particularly those in older or noisy units. Its key benefit is providing excellent protection under extreme conditions. A caveat is that it's designed for non-synchromesh transmissions where outright power is not the primary concern. This fully synthetic oil offers superior lubrication and protection for demanding applications, meeting API GL5 and GL6 specifications.

All features

Model Part Number58104
BrandRed Line

Extended Product Information

FAQs

Is this oil suitable for all manual transmissions?

No, this oil is specifically designed for non-synchromesh manual transmissions. Always check your vehicle's service manual to confirm compatibility.

What does '80W140' mean?

'80W' refers to the oil's viscosity at colder temperatures (W for Winter), while '140' refers to its viscosity at higher operating temperatures. This indicates a thicker oil suitable for heavy-duty and high-temperature use.

Can I use this oil in my limited-slip differential?

This specific formulation does not contain limited-slip additives. If your differential requires them, you may need a different Red Line product or an appropriate additive.

How often should I change this gear oil?

Refer to your vehicle manufacturer's recommended service intervals for gear oil changes. For heavy-duty or racing applications, more frequent changes may be beneficial.

What is the main benefit of using synthetic gear oil?

Synthetic gear oils like Red Line 80W140 offer superior thermal stability, better lubrication under extreme pressure, and longer service life compared to conventional mineral oils.

Can this oil be mixed with conventional gear oil?

While it may mix, it is best practice to drain and refill with Red Line 80W140 only to achieve its full performance benefits and avoid potential compatibility issues.

Troubleshooting

Gear noise persists after oil change

While this oil is effective at quieting noise, severe mechanical damage or wear may be the root cause. Inspect components for damage if noise is extreme or worsens. Ensure the correct oil level is maintained.

Oil appears foamy

Excessive foaming can indicate moisture contamination or excessive aeration. Check seals for leaks and ensure the fill cap is properly seated. In some high-performance applications, temporary foaming under extreme use may occur but should dissipate.

Difficulty shifting in manual transmission (if used)

This oil is specified for non-synchromesh transmissions. If used in a transmission with synchromesh, it may lead to shifting issues. Consult your vehicle manual to confirm transmission type and oil specifications.

Pros and Cons

Pros

  • Exceptional protection in extreme and high-temperature environments.
  • Effectively reduces noise in older differential units.
  • Fully synthetic formula offers superior lubrication and longevity.
  • Meets demanding API GL5 and GL6 specifications.
  • Ideal for heavy-duty and race applications where extreme conditions are present.

Cons

  • Not designed for applications prioritizing maximum outright power.
  • Primarily suited for non-synchromesh manual transmissions.
  • May require more frequent checks in very light-duty applications.
  • Synthetic nature may have compatibility considerations with certain older seal materials (though generally excellent).

Setup, Compatibility & Care

Setup: This product is a direct replacement for existing gear oil. Ensure the differential or transmission is properly drained of old fluid before refilling. Use appropriate equipment to fill the unit to the manufacturer's specified level.

Compatibility: The Red Line 80W140 is recommended for differentials and non-synchromesh manual transmissions specifying API GL5 and GL6 oil standards. It is suitable for both road and race applications. Always consult your vehicle's service manual for specific fluid requirements.

Care: Store the oil in its original container in a cool, dry place, away from direct sunlight. Ensure the cap is tightly sealed to prevent contamination. While synthetic, regular fluid changes according to your vehicle manufacturer's recommendations are advised for optimal performance and protection.

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