When it comes to the fluids in our vehicles, we often wonder if we can mix different weights of oils together. In this article, we will specifically discuss whether it is safe to mix 75W90 and 75W140 gear oils.
Understanding Gear Oil Weight
Before we dive into the topic, it’s important to understand what gear oil weight means. The number before the ‘W’ represents the oil’s viscosity at colder temperatures, while the number after the ‘W’ symbolizes the viscosity at higher temperatures.
So, 75W90 gear oil is thinner at cold temperatures compared to 75W140, but thicker at higher temperatures. Mixing these two different weights of gear oil can affect the overall performance and protection of your vehicle’s gears.
Expert Opinions
There are mixed opinions among automotive experts regarding mixing different gear oil weights. Some argue that as long as the difference in weight is not significant, it should not cause any harm to your vehicle’s transmission system. Others, however, believe that it is best to stick to the manufacturer’s recommendations and not mix different weights.
Forums and online communities are filled with discussions on this topic. While some users have reported no issues from mixing these gear oils, others have experienced problems such as excessive noise, reduced performance, and even gear failure.
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Manufacturer Recommendations
It is always recommended to follow the guidelines provided by your vehicle’s manufacturer. They have conducted extensive testing to determine the best gear oil weight for optimal performance and protection.
If your vehicle’s manual specifies 75W90 or 75W140 gear oil, it is best to use the recommended weight. Mixing different gear oil weights can alter the oil’s properties and may not provide the same level of protection required for your vehicle.
Frequently Asked Questions Of Can You Mix 75w90 And 75w140
Is 75w90 Thicker Than 75w140?
No, 75W90 is not thicker than 75W140.
What Is 75w 140 Gear Oil Used For?
75W 140 gear oil is used for heavy-duty applications, such as in trucks, SUVs, and other vehicles that require high-performance lubrication. It is specifically formulated to provide superior protection for gears operating under high stress and extreme temperatures, ensuring smooth operation and extended gear life.
Mixing different weights of gear oil is generally not recommended, as it can affect the performance and durability of the gears.
What Is The Difference Between Gear Oil 90 And 140?
Gear oil 90 and 140 are different in terms of viscosity. Gear oil 90 has a lower viscosity compared to gear oil 140. The lower the number, the thinner the oil. Gear oil 90 is suitable for lighter loads and normal operating conditions, while gear oil 140 is recommended for heavy-duty applications and high temperatures.
Make sure to use the appropriate gear oil for optimal performance and protection of your equipment.
Is There A Big Difference Between 75w90 And 80w90?
There is a slight difference between 75W90 and 80W90 gear oil, with the latter being slightly thicker. However, they are generally interchangeable, and mixing them will not cause any significant issues.
Can You Mix 75w90 And 75w140 Gear Oils?
Yes, you can safely mix 75W90 and 75W140 gear oils as they are both performance gear oils with similar viscosity ratings. Mixing them will not cause any adverse effects on your vehicle’s performance or damage the internal components of your gearbox.
Conclusion
In conclusion, while there are mixed opinions on whether it is safe to mix 75W90 and 75W140 gear oils, it is generally recommended to stick to the manufacturer’s guidelines. Mixing different gear oil weights can potentially compromise your vehicle’s transmission system and overall performance.
If you are unsure about which gear oil to use or have any concerns about mixing different weights, it is best to consult with a certified mechanic or contact your vehicle’s manufacturer for further guidance. They can provide you with the most accurate information based on the make and model of your vehicle.
