What gear oil to use in a limited slip differential?
Choosing the right gear oil for your limited slip differential (LSD) is crucial for maintaining optimal performance and longevity of your vehicle. As an experienced auto service provider, I understand the importance of using the correct lubricant to ensure smooth operation and prevent wear. In this article, we will explore the types of gear oils suitable for LSDs, their specifications, and some tips for proper maintenance.
Understanding Limited Slip Differentials
A limited slip differential is designed to allow some degree of wheel slip while still providing power to both wheels. This is particularly beneficial in situations where one wheel may lose traction, such as on slippery surfaces. To function effectively, LSDs require specific types of gear oil that can handle the unique demands placed on them.
Types of Gear Oil for Limited Slip Differentials
When selecting gear oil for your LSD, consider the following types:
- Conventional Gear Oil: Typically, a high-quality conventional gear oil with a viscosity rating of 75W-90 is recommended for most LSDs. This oil provides adequate lubrication and protection under normal driving conditions.
- Synthetic Gear Oil: Synthetic oils, such as 75W-90 or 80W-140, offer superior performance, especially in extreme temperatures. They provide better protection against wear and can enhance fuel efficiency.
- Limited Slip Additives: Some gear oils come with limited slip additives that help reduce chatter and improve the smooth operation of the differential. If your gear oil does not contain these additives, you may need to add them separately.
Key Specifications to Look For
When choosing gear oil for your LSD, pay attention to the following specifications:
- Viscosity: Ensure the oil meets the viscosity requirements specified in your vehicle's owner manual, typically 75W-90 or 80W-140.
- API Rating: Look for oils with an API (American Petroleum Institute) rating of GL-5, which indicates that the oil is suitable for hypoid gears and LSDs.
- Limited Slip Compatibility: Always check if the oil is specifically formulated for limited slip differentials to ensure optimal performance.
Tips for Maintaining Your Limited Slip Differential
To keep your limited slip differential in top shape, consider the following maintenance tips:
- Regularly check and change the gear oil according to your vehicle's maintenance schedule.
- Monitor for any unusual noises or vibrations, which could indicate a problem with the differential.
- Use the recommended gear oil to avoid potential damage and ensure proper function.
In conclusion, selecting the right gear oil for your limited slip differential is essential for maintaining your vehicle's performance and longevity. By understanding the types of oils available and adhering to the specifications and maintenance tips provided, you can ensure that your LSD operates smoothly and efficiently.
Frequently Asked Questions
Does limited-slip differential require additive?
Instead of formulating multiple gear lubes of the same viscosity, but different frictional properties, to address occasional chatter in limited-slip differentials, gear-lube friction-modifier additives can be used to alter the fluid's original frictional properties and eliminate chatter.
Should I use gl4 or gl5 for diff?
GL-5 has roughly twice the amount of EP additives compared to GL-4, which is why it is often used in high-pressure circumstances such as in a front axle and rear axle differential. Sulphur/Phosphorus additives however have an unfavourable property: they can react aggressively towards bronze and copper.
Which Valvoline gear oil is recommended for limited-slip differentials?
Valvoline FlexFill SAE 75W-140 Full Synthetic Gear Oil is recommended for use in axle applications requiring factory-fill or drain-and-fill levels for limited slip performance.
How often do you change limited slip differential fluid?
For a normal, daily driven, vehicles we advise that you change the differential oil every 50,000 miles. For vehicles that are hard worked, such as trucks that do a lot of heavy towing, we advise that you change the differential oil every 15,000 miles.
Does Lucas 75w90 have limited slip additive?
Our formulation contains an embedded friction modifier for use in standard or limited slip differentials. Recommended by Lucas Oil for any application requiring SAE 75W-90 gear oil, whether in light duty trucks, SUVs, or commercial vehicles.
Which lubricants are used in a limited slip differential?
DEXRON® LS GEAR OIL 75W-90.
Is GL5 gear oil for limited slip?
API GL-5 oils can be used in limited slip differentials only if they correspond to the requirements of specification MIL-L-2105D or ZF TE-ML-05. In this case the designation of class will be another, for example API GL-5+ or API GL-5 LS.''
Does limited slip differential need additive?
Instead of formulating multiple gear lubes of the same viscosity, but different frictional properties, to address occasional chatter in limited-slip differentials, gear-lube friction-modifier additives can be used to alter the fluid's original frictional properties and eliminate chatter.
What happens if you never change differential fluid?
Most differentials need a fluid change at about 50,000 miles. If left too long or if the fluid starts to run low, the differential will become noisy and can eventually fail. If that happens, the gears can seize, locking up the rear wheels and potentially causing a lot of damage or even an accident.
What gear oil is best for limited slip differential?
Stick to non-synthetic 80w90 gear oil specific for LSD's. No addictives necessary as they're already in the LSD specific oil. Like others have said LUCAS is a good choice. (I personally use it as well) Call and ask around as it's usually not carried in larger quantities at most chain stores. We need 4 bottles.
