If you’re thinking – can I use 85W140 instead of 75W90 gear oil in my equipment, the answer is yes, you can. However, there are important factors to consider before making the switch.
85W140 gear oil has a higher viscosity than 75W90, which can offer better protection for heavily loaded and high-temperature gear systems, but it can also have downsides such as reduced fuel efficiency and increased wear on cold starts.
In this article, we will explore the advantages and disadvantages of using 85W140 instead of 75W90 gear oil, the differences between the two, and factors to consider when choosing gear oil.
By the end of this article, you’ll have a better understanding of gear oil viscosity and be equipped with the knowledge to make the best decision for your equipment.
Also Read: Can You Use 15w40 Instead of 10w30 / 0W40 vs. 5W40
Can I Use 85w140 instead Of 75w90?
Yes, you can use 85W140 instead of 75W90 . But using 85W140 instead of 75W90 might not be ideal in all situations. 85W140 oil is thicker at both low and high temperatures compared to 75W90. It might work in some cases. But using a higher viscosity oil than recommended can affect performance, especially in colder conditions. Because it might not flow easily.
Differences Between 85W140 and 75W90 – 85W140 vs 75W90
Let’s see the detailed comparison between these two gear oils.
| Property | 85W140 Gear Oil | 75W90 Gear Oil |
|---|---|---|
| Viscosity | High | Low |
| Protection | Better protection for heavily loaded and high-temperature gear systems | Suitable for general purpose and light-duty gear systems |
| Fuel Efficiency | Reduces fuel efficiency due to increased resistance to flow | Improves fuel efficiency by reducing resistance to flow |
| Cold Weather Performance | May not perform well in cold weather and can lead to increased wear on cold starts | Designed to operate effectively in cold weather conditions |
| Lifespan | Can last longer in high-stress environments and reduce the frequency of oil changes | Requires more frequent oil changes due to lower viscosity |
| Cost | Generally more expensive due to higher viscosity rating | Lower cost due to lower viscosity rating |
Relevant: 10w30 vs 0w20 Comparison
Advantages And Disadvantages Of Using 85W140 Instead Of 75W90
Here are some of the advantages and disadvantages of using 85W140 instead of 75W90 gear oil:
Advantages of using 85W140 gear oil:
- Better protection: 85W140 gear oil has a higher viscosity index and thicker oil film, which can provide better protection for heavily loaded and high-temperature gear systems.
- Longer lifespan: The higher viscosity of 85W140 gear oil means it can last longer in high-stress environments and reduce the frequency of oil changes.
- Less wear and tear: The thicker oil film of 85W140 gear oil can reduce wear and tear on gear components, leading to longer equipment lifespan.
Disadvantages of using 85W140 gear oil:
- Reduced fuel efficiency: The higher viscosity of 85W140 gear oil can reduce fuel efficiency due to increased resistance to flow.
- Cold weather performance: 85W140 gear oil may not perform well in cold weather and can lead to increased wear on cold starts.
- Higher initial cost: 85W140 gear oil is generally more expensive than 75W90 gear oil due to its higher viscosity rating.
Overall, the decision to use 85W140 gear oil instead of 75W90 should be based on the specific needs of the equipment and the environment in which it operates.
If the equipment is heavily loaded or operates in high-temperature environments, 85W140 gear oil may offer better protection.
However, if fuel efficiency and cold weather performance are important factors, 75W90 gear oil may be the better choice. It’s essential to consult the equipment manufacturer’s recommendations before making a decision.
Also Read: Can I Use 10w40 Instead Of 15w40
Understanding Gear Oil Viscosity
Viscosity refers to the resistance of a fluid to flow. In the context of gear oil, viscosity is the measure of how thick or thin the oil is at a specific temperature.
Gear oil viscosity is represented by a set of numbers and letters, such as 85W140 or 75W90, where the numbers indicate the oil’s viscosity at low and high temperatures.
The first number represents the oil’s viscosity at low temperatures, which is important for cold weather performance.
The lower the number, the thinner the oil and the easier it is to flow. The “W” in the viscosity rating stands for winter, indicating the oil’s cold weather performance.
The second number represents the oil’s viscosity at high temperatures, which is important for protecting the gears from wear and tear under heavy loads and high temperatures. The higher the number, the thicker the oil and the better the protection.
Explanation Of Viscosity And Its Importance In Gear Oil
Viscosity is an essential characteristic of gear oil because it determines the oil’s ability to protect the gears and lubricate the moving parts in a gear system.
Viscosity is measured by the oil’s resistance to flow, which is affected by factors such as temperature, pressure, and shear stress.
The viscosity of gear oil is important because it determines the oil’s ability to form a protective barrier on the gears and lubricate the moving parts of the gear system.
If the oil is too thin, it won’t provide adequate protection to the gears, and if it’s too thick, it will create too much resistance, leading to decreased performance and energy efficiency.
How Viscosity Affects Gear Oil Performance?
The proper gear oil viscosity is determined by the operating conditions of the gear system, such as temperature, load, and speed.
In general, gear systems that operate under high temperatures and heavy loads require gear oils with higher viscosity ratings to ensure adequate protection.
Choosing the right gear oil viscosity is crucial for maximizing the performance and lifespan of your equipment.
Gear systems that are not properly lubricated can suffer from increased wear and tear, reduced efficiency, and even failure, leading to costly repairs and downtime.
Therefore, it’s essential to select the appropriate gear oil viscosity and follow the equipment manufacturer’s recommendations for optimal performance and protection.
Explanation Of Gear Oil Compatibility
Gear oil compatibility refers to the ability of different gear oils to work effectively together without causing any adverse effects.
It’s important to ensure that the gear oil you use is compatible with the equipment and any other oils that may have been used previously.
Using incompatible gear oils can result in a loss of performance and protection, increased wear and tear, and even equipment failure.
For example, mixing mineral-based and synthetic-based gear oils can cause a chemical reaction that leads to the formation of deposits and sludge, clogging the gear system and reducing its efficiency.
The best way to ensure gear oil compatibility is to follow the equipment manufacturer’s recommendations and use the same type and brand of gear oil for all oil changes.
If you need to switch to a different gear oil, it’s important to thoroughly flush the gear system to remove any residual oil before adding the new one.
It’s also important to note that some gear oils are specifically formulated to be compatible with other oils, while others are not.
It’s essential to consult the gear oil manufacturer’s recommendations and guidelines to ensure that you’re using compatible oils and avoid any potential problems.
3 Factors to Consider When Choosing Gear Oil
There are several factors to consider when selecting gear oil, including:
1. Manufacturer recommendations
The equipment manufacturer’s recommendations are a crucial factor to consider when selecting gear oil. The manufacturer will specify the type and viscosity of gear oil that is best suited for the equipment and gear system.
It’s essential to follow these recommendations to ensure optimal performance, protection, and avoid any potential warranty issues.
2. Operating conditions
The operating conditions of the gear system are another crucial factor to consider when selecting gear oil. The operating conditions include temperature, load, speed, and environment.
For example, gear systems that operate under high temperatures and heavy loads require gear oils with higher viscosity ratings to ensure adequate protection. Similarly, gear systems that operate in wet or dusty environments may require gear oils with additives to protect against corrosion and contamination.
3. Type of equipment and gear system
The type of equipment and gear system is also an important factor to consider when selecting gear oil. Different types of gear systems, such as spur gears, bevel gears, worm gears, and helical gears, require different types of gear oil.
Some gear systems may also require specialty gear oils, such as those with extreme pressure additives or those that are food-grade.
Other factors to consider when selecting gear oil include the oil’s additives, compatibility with other oils, and environmental regulations.
It’s essential to consult the gear oil manufacturer’s recommendations and guidelines and work with a reputable supplier to ensure that you’re using the right gear oil for your equipment and gear system.
FAQ’s
Q: Can You Use 75w-90 Transmission Oil Instead of 85w-140 In Your Automatic Scooter If 85w-140 is Recommended By Owner’s Manual?
No, it is not recommended to use 75w-90 transmission oil instead of 85w-140 in your automatic scooter if 85w-140 is recommended by the owner’s manual. The recommended oil viscosity is carefully selected by the manufacturer to ensure optimal performance and protection for the equipment and gear system. Using a different oil viscosity than what is recommended can lead to increased wear and tear, reduced performance, and potential equipment failure.
Q: Is Heavier Gear Oil Better?
Not necessarily. The appropriate viscosity of gear oil depends on the manufacturer’s specifications for the equipment. Using a thicker oil than recommended can result in increased friction, wear, and reduced fuel efficiency.
Using a thinner oil can result in inadequate lubrication and premature wear. It is best to consult with a mechanic or refer to the equipment’s manual for the recommended viscosity of gear oil.
Wrap Up!
Gear oil viscosity is an essential factor to consider when selecting gear oil for your equipment and gear system.
While it may be tempting to use a higher viscosity oil such as 85W140 instead of 75W90, it’s essential to ensure compatibility and consider the manufacturer’s recommendations and operating conditions.
