What To Choose Between 75w90 vs 80w90? [Detailed Comparison]

It’s a must to use the gear oil when you are owning automobiles. In that case, you need to have good ideas about the properties of different gear oil. 75w90 and 80w90 are two of the popular gear oils in the market now!

But these aren’t the same nor interchangeable. And that’s why people struggle while choosing between them.

So which one to go for between 75w90 vs 80w90?

Well, 80w90 has a greater density than that of 75w90. On the other hand, additives of 75w90 are quite standard. In terms of the pricing, 80w90 is quite reasonable whereas 75w90 is expensive.

Do you think it’s enough to understand? Well, it’s actually not! So, keep on reading to know more!

Keep on reading along!

75w90 vs 80w90: Quick Comparison

In order to distinguish between 75w90 and 80w90, you need to have a clear idea on the properties. Our quick comparison will help you have an overview. Look at the table below to get a comprehensive distinction.


75w90 vs 80w90: Head To Head Battle

You have just come up with a table comparison above. But are you still confused about making the decision? Well, it’s absolutely fine! We’ve got your back with an adequately detailed comparison, given below-

Density Of Oil

The density of the oil basically measures its thickness. The density of both 75w90 and 80w90 is similar to that of each other. However, their density is not exactly the same.

The density of 75w90 is 0.86. Comparing the density of this oil in general, it is quite high. The more the density of oil, the better. This oil is good enough in protecting the ears compared to the thinner ones. 

However, thicker oil gets clumpy at times, decreasing the efficiency significantly.

The 80w90 gear oil has an even greater density than 75w90. Its density is 0.90. So, it’s a bit thicker which can protect the ears even better. But if this gets clumpy then it could be really tough to operate the gear properly.

Winner: When it comes to the density of the oil, 80w90 is the winner. Because the density of this gear oil is greater, giving more advantages. 

Additives Of Oil

75w90 gear oil is extremely smooth and dependable in heavy-duty applications. Other lubricants are not this much sufficient for the machines. It has an adhesive backing that coats gears and keeps them from squeezing out. 

Most gear lubricants, on the other hand, are just not strong enough to withstand the extreme strain. This gear oil has been engineered to withstand severe temperatures while still providing adequate lubrication. 

The 80w90, on the other hand, is fortified with anti-wear and lubricating chemicals. It aids in the management of wear and tears as well as heat control additives.

These characteristics aren’t found in typical gear oils. For all racing automobiles, this gear oil is great. 

Winner: In terms of additives, 75w90 is the winner. Because it can withstand the extreme strain of the gear. 


The price is one of the most important factors to consider for oil. It is a must factor when it’s especially about buying something. So, which one to use between 80w90 and 75w90 when it comes to the pricing?

Well, 75w90 is a bit expensive gear oil in the market currently. If you want to buy a liter of 75w90, you’d have to spend around $10. So, this might not be that convenient for the users to buy often.

This gear oil is expensive compared to the others as it’s a balanced oil. As a result, it’s absolutely worth it if you’re looking for an ideal balance.

On the other hand, 80w90 is way lesser in price than that 75w90. You would have to spend only about $4 to buy a liter of 80w90. So, this oil is quite reasonable and affordable to use at any time.

Winner: We decided to keep 80w90 before 75w90 as it’s cheaper. So, 80w90 is the winner in terms of price.

Can I Use 80w90 Instead of 75w90 and Vice Versa?

You may still be confused about the overall evaluation. So, we are here to give you a final brief right away!

If you want better additives, go for 75w90. But if you are more concerned about its price and density, 80w90 is for you! Remember at the end of the day, it’s your call. Pick whichever you feel is better for you.

What Happens If I Put 75w90 Instead of 80w90?

If your car engine needs efficiency and protection from stain, putting 75w90 will be pretty useful. Because 75w90 is a thinner oil type compared to 80w90. Therefore, you won’t face much difficulty after switching to 75w90 from 80w90. 

With 75w90, your car can be operated easily. However, it’ll lack the protection which 80w90 used to give. 

Can I Mix 75w90 and 80w90?

Yes, you can definitely try out mixing 75w90 with 80w90. By mixing these two, the oil density will balance out. Simply put, with the thinner 75w90 and thicker 80w90, you’ll now have a modified oil type. This way your engine will work efficiently and the protection of it will also be ensured.

However, if your engine needs one particular oil type, stick to that!

Well, that is all about 75w90 vs 80w90. We hope this guide was of use to you!


Question: Why is 75w90 oil used?

Answer: Under high-pressure circumstances, 75W-90 gear oil is required. For limited-slip differentials and use in cold climates, it is suggested. Heavy-duty manual gearboxes, final drives, and axles commonly employ it. The heavy film left by this oil will not be affected by the high temperatures.

Question: What happens if I mix gear oil?

Answer: It is highly recommended not to mix gear oil. Mineral oils, esters, and PAOs are all compatible with one other. Only synthetic lubricants containing poly glycol can be combined with other lubricant types. In the casings, these can be reacted and create gum gels. These can also be immiscible and incompatible with other poly glycols at times.

Question: Are the gear oil and transmission oil the same?

Answer: Transmission oil has similar properties to gear oil. It lubricates both the gears and the transmission. However, it is also used to lubricate the entire powertrain, including the gearbox and prop shaft. It also has the ability to lubricate the clutch and final drive shafts. Transmission oil is also a word that is commonly used to denote lubricants. It is known as ATF and is designed specifically for automatic transmissions.

The Final Words

Now you know what to choose between 75w90 vs 80w90! We hope you could help you with your final decision!

Make sure to consider the factors evaluating yourself with the given information. We hope you get the best one!

Best wishes!

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