What kind of gear oil does a Subaru take?
Subaru vehicles typically require a specific type of gear oil for their manual and automatic transmissions. The recommended gear oil for most Subaru models is a synthetic GL-5 gear oil with a viscosity of 75W-90.
Subaru Gear Oil Specifications
Subaru's transmission and differential systems are designed to work best with a high-quality, synthetic gear oil that meets the following specifications:
- API Service Classification: GL-5
- Viscosity: 75W-90
- Meets or exceeds Subaru's own gear oil standard, which is known as "Subaru Extra MT Gear Oil" or "Subaru Extra AT Gear Oil"
Using the correct gear oil is important for proper lubrication, wear protection, and optimal performance of Subaru's manual and automatic transmissions, as well as the front and rear differentials.
Why 75W-90 Gear Oil?
The 75W-90 viscosity grade is recommended for Subaru vehicles because it provides the right balance of flow and thickness for the transmission and differential components. The "75W" indicates the oil's low-temperature viscosity, allowing it to flow easily in cold weather, while the "90" denotes the oil's higher viscosity at normal operating temperatures.
This multi-grade viscosity helps ensure proper lubrication across a wide range of temperatures, from freezing cold to scorching hot. It also helps reduce wear and tear on the gears and bearings inside the transmission and differentials.
Synthetic vs. Conventional Gear Oil
Subaru specifically recommends using a synthetic gear oil, as it offers several advantages over conventional mineral-based gear oils:
- Improved Thermal Stability: Synthetic oils can better withstand the high temperatures and pressures inside transmissions and differentials, reducing the risk of oil breakdown and degradation.
- Enhanced Wear Protection: Synthetic gear oils provide superior lubrication and wear resistance, helping to extend the life of transmission and differential components.
- Better Low-Temperature Fluidity: Synthetic oils flow more easily in cold weather, improving cold-weather shifting and differential performance.
For the best performance and protection of your Subaru's drivetrain, it's important to use the recommended 75W-90 synthetic GL-5 gear oil.
What kind of fluid does a Subaru rear differential take?
Most Subaru models require 75W-90 GL-5 synthetic gear oil for the rear differential, but it's essential to confirm the exact specification for your vehicle. Valvoline, Subaru's own brand, and other high-quality brands like Red Line offer suitable products. Always check your owner's manual for the most accurate information and be sure to replace the crush washers on the drain and fill plugs when servicing.
Recommended fluid specifications
- Weight: 75W-90
- API Rating: GL-5
- Type: Full synthetic is recommended for most applications
How to check for the correct fluid
- Owner's Manual: The most reliable source for the correct fluid type and capacity is your Subaru's owner's manual.
- Online Resources: Check forums like Reddit or sites like Advance Auto Parts by entering your car's make, model, and year.
- Dealer or Mechanic: A Subaru dealership or a trusted mechanic can confirm the exact specification for your vehicle.
Important considerations
- Limited-Slip Differential (LSD): If your Subaru has a limited-slip differential, ensure the fluid is compatible with LSDs. Some fluids, like Red Line 75W-90 NS, are specifically made for manual transmissions and don't have the additives needed for a limited-slip rear differential.
- Crush Washers: Always replace the crush washers on both the drain and fill plugs to ensure a proper seal.
- Torque Specifications: Tighten the plugs to the manufacturer's specified torque. For some Subaru models, this is around 49 Nm or 37 foot-pounds.
Is the Subaru 75w90 GL5?
It's what Subaru uses and recommends! Specs: 1-quart bottles. 75w90 Weight - GL-5.
Which is better, 75w90 or 80w90?
Yes, 75W-90 is generally better than 80W-90 because it flows better in cold temperatures and offers better protection across a wider range of temperatures, leading to improved efficiency and longer drain intervals. The "75W" rating indicates better cold-weather performance compared to "80W," while both have a similar "90" rating for high-temperature viscosity. This makes 75W-90 a preferred choice, especially in climates with significant temperature swings or for applications prioritizing fuel efficiency and reduced maintenance.
Advantages of 75W-90 over 80W-90
- Better cold-start performance: The "75W" designation means the oil is thinner when cold, making it easier for the engine to start and providing better lubrication to internal components immediately.
- Wider operating temperature range: 75W-90 maintains a more consistent thickness across a wide temperature range, offering better protection in both hot and cold conditions.
- Improved fuel efficiency: The lower viscosity at colder temperatures can reduce drag and lead to a small improvement in fuel economy, as noted by OEMs.
- Longer service life: 75W-90, especially when synthetic, is more resistant to oxidation and thickening, allowing for longer drain intervals and reduced maintenance costs.
When 80W-90 might be sufficient
- Standard climate conditions: In regions with mild and stable climates, the difference in performance may be minimal, and 80W-90 could be adequate.
- Budget-friendly choice: 80W-90 is often less expensive upfront than 75W-90. However, the total cost of ownership can be higher when factoring in reduced efficiency and shorter drain intervals.
Summary
| Feature | 75W-90 | 80W-90 |
|---|---|---|
| Cold Flow | Superior (flows better in winter) | Adequate (flows less easily when cold) |
| High-Temperature Viscosity | Same (90 weight) | Same (90 weight) |
| Performance | Better for extreme climates and efficiency | Adequate for standard climates |
| Cost | Higher initial cost | Lower initial cost |
| Maintenance | Longer drain intervals | Shorter drain intervals |
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In most modern vehicles and climates, especially where efficiency and protection are priorities, 75W-90 is the better, more modern choice. However, always consult your vehicle's owner's manual to ensure you are using the manufacturer's recommended oil viscosity.
What kind of fluid does a Subaru front differential take?
Just kind of work your way in here one by one if you can keep your finger.
