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Can I Use 75W-90 Instead of 75W-85: The Ultimate Debate

Published by Dustin Babich on

No, it is not recommended to use 75w-90 instead of 75w-85. 75w-85 and 75w-90 have different viscosities, and using the wrong one can lead to problems with your vehicle’s gearbox or differential.

Choosing the right gear oil is essential for maintaining your vehicle’s performance and preventing damage. While 75w-90 and 75w-85 may seem similar, they have different viscosities, with 75w-85 being thinner than 75w-90. This difference is vital, as using the wrong oil can cause problems with the gearbox or differential.

It is always best to opt for the oil recommended by the manufacturer to ensure optimal performance and prevent costly repairs down the road. So, before you make the switch, consult your vehicle’s owner’s manual, or speak with a reputable mechanic to ensure you are using the correct oil.

Understanding 75W-90 And 75W-85

Understanding 75w-90 and 75w-85 can get confusing, but it’s important. The viscosity rating or thickness of the oil is what sets them apart. 75w-90 is thicker than 75w-85. The difference in viscosity is due to the variety of additives in the two oils.

75w-85 oil is generally used for fuel efficiency while 75w-90 is used for high performance. Using the wrong oil can put significant wear and tear on your vehicle’s engine. It’s best to stick to the manufacturer’s recommended oil type. Ultimately, it’s up to you to decide which oil is best for your vehicle’s needs.

Just remember to always check with your owner’s manual before making any decisions.

Advantages And Disadvantages Of Using 75W-90 Instead Of 75W-85

Using 75w-90 instead of 75w-85 in vehicles can provide a few benefits. It contains additives that offer better wear protection and is more versatile, suitable for different temperature ranges. However, a few disadvantages include possible glazing of synchronizer rings and may reduce performance due to the higher viscosity level.

It can also result in less fuel efficiency and may not meet the specifications required by certain manufacturers. Determine if using 75w-90 is the best fit for your vehicle by checking owner’s manuals or consulting with a trusted mechanic. Ultimately, factors such as temperature, driving habits and manufacturer recommendations should be taken into consideration.

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So, make an informed decision to ensure your vehicle operates at its peak performance.

Advantages And Disadvantages Of Using 75W-85 Instead Of 75W-90

Using the correct type of gear oil in a vehicle’s transmission is crucial to its performance. In the debate of 75w-85 vs. 75w-90, each option has its advantages and disadvantages. One major advantage of 75w-85 is that it offers improved fuel efficiency as this type of oil has lower viscosity.

However, using 75w-85 may not provide the same level of protection as 75w-90, especially in extreme temperatures. It may cause premature wear and tear of the transmission components and reduce the overall lifespan of the vehicle. Therefore, it is essential to consult the manufacturer’s manual and use the appropriate type of gear oil recommended by them to ensure the transmission’s longevity and peak performance.

Understanding Your Vehicle’S Requirements

Determining your vehicle’s required oil viscosity is crucial in maintaining peak performance and prolonging its lifespan. Using the wrong viscosity oil, such as substituting 75w-90 for 75w-85, can have a significant impact on your vehicle’s engine. It can result in increased wear and tear, reduced fuel efficiency, and potential damage to your vehicle’s transmission.

To ensure you are using the correct oil viscosity, always refer to your vehicle’s owner manual and follow the recommended guidelines. It may seem like a small detail, but using the correct oil viscosity can make a huge difference in your vehicle’s performance and longevity.

So, take the time to understand your vehicle’s requirements and choose the right oil to keep it running smoothly.

Making A Decision: Which Is Better?

When it comes to choosing between 75w-90 and 75w-85, there are a few things to consider. Optimal use depends on the temperature conditions and performance of your vehicle. Both options are great for gear lubrication, but their viscosity and composition vary slightly.

If you expect to experience colder temperatures, 75w-85 might be the better option, as it flows more easily. Higher temperatures call for the thicker, more heat-resistant formula of 75w-90. Ultimately, the decision rests with the needs of your specific vehicle.

By understanding the factors at play and making an informed decision, you can ensure optimal performance and longevity for your vehicle’s gears.

Frequently Asked Questions Of Can I Use 75W-90 Instead Of 75W-85

Can I Use 75W-90 Instead Of 75W-85?

Yes, you can use 75w-90 instead of 75w-85 as it provides better protection and performance in higher temperatures. However, it’s always best to check your owner’s manual for the recommended viscosity grade before making a change.

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What Is The Difference Between 75W-90 And 75W-85?

The difference between 75w-90 and 75w-85 is the thickness or viscosity under different temperature ranges. 75w-90 is thicker than 75w-85, providing better protection and performance in higher temperatures.

Can I Mix 75W-90 And 75W-85 Together?

It’s not recommended to mix 75w-90 and 75w-85 together as it can harm the performance of both oils. Mixing them will alter the viscosity and reduce the integrity of the lubricant, potentially causing damage to your engine.

What Happens If I Use The Wrong Viscosity Grade?

If you use the wrong viscosity grade, it can lead to poor engine performance, premature wear, and reduced fuel efficiency. Using the incorrect viscosity can also cause damage to your transmission, leading to costly repairs.

Does The Brand Of Lubricant Matter?

The brand of lubricant matters as different brands have different additive packages, which can affect performance and compatibility with your vehicle. It’s always best to use the brand and type of lubricant recommended by your vehicle manufacturer.


As a car owner, it is essential to use the right type of lubricants for your vehicle to ensure its effective functioning. After examining the differences between 75w-90 and 75w-85 gear oils, it is evident that they have similar properties, but the latter one has better fluidity and cold flow properties.

By filling your car with 75w-90 oil, you might end up experiencing slow shifting and noise problems during cold temperatures. However, you may use 75w-90 oil as a substitute if 75w-85 oil is unavailable. To sum up, it is always better to use the recommended lubricants to prolong your vehicle’s lifespan and prevent any potential damage.

So, it is advisable to stick to the manufacturer’s recommendations to maintain your car’s performance and avoid problems down the line. Always remember that taking care of your vehicle is an investment in your future road safety and comfort.

Dustin Babich

Dustin Babich

Dustin Babich

As the passionate author behind, Dustin Babich is a knowledgeable expert in all things automotive. With a deep understanding of car tools, equipment, engines, and troubleshooting techniques, Dustin Babich shares invaluable insights, practical tips, and effective solutions to empower readers in overcoming car-related challenges.


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