Can you mix different weight gear oil? Mineral oils, PAOs and esters may all be mixed together. Only polyglycol type synthetic oils (PG or PAG) may not be mixed with the other lubricant types. They can react together and form gum gels in the casings. Furthermore, they can sometimes be incompatible and immiscible with other polyglycols.

Can you mix two different weights of gear oil? You can mix conventional and synthetic gear lubes, they are compatible with each other, and you can mix their viscosities without problem. The resuliting viscosity will just be somewhere between the two viscosities that were mixed together.

Is it OK to mix different brands of gear oil? Registered. Pure oils will mix okay, but it is the additives that each can contains. It is not worth the risk that additives will exhibit some form of incompatibility.

Can you mix 75w90 and 80w90 gear oil? You are fine to mix the two I’d think. No weird additives, just basic Castrol 75w90.

Can you mix different weight gear oil? – Related Questions

Can I use 80w90 instead of 75w140?

Can I use 75w140 instead of 80w90? Either one is fine. Generally the synthetic 75w-140 is for HD applications such as towing, but it will work fine in any application.

Can I mix ATF with gear oil?

When different types of oils and greases are mixed together, it can spell disaster for machinery. This is why it’s best to avoid mixing lubricants. For example, if you mixed 1 gallon of automatic transmission fluid (ATF) with 300 gallons of gear oil from the same mineral group, the dilution would hardly be noticeable.

Can you mix GL4 and GL5 gear oil?

Note that the transmission lube is a GL4 while the differential lube is a GL5. You can use GL5 in the transmission, of course, but it is not necessary; the GL5 has Extreme Pressure additives, needed for the sliding action of the hypoid gears in the differential.

Can you mix manual transmission fluid brands?

Short answer – you can mix them. Mixing different high quality MT fluids is not like mixing orange and green antifreeze (OAT based verses IAT based fluids). Top quality MT fluids are very similar. The greatest risk of using improper MT oil/fluid is that it contains agents that are not synchronizer safe.

Can I use engine oil as gear oil?

Gearbox oil has a higher viscosity than engine oil and this is because it better protects the gears, ensuring you have a smooth transition between them. Therefore, you cannot use engine oil in your gearbox.

Can you mix Valvoline and Mobil 1 gear oil?

It’s not going to harm anything. It’s not going to harm anything. True, the chances of any kind of harm resulting are astronomically remote. But the oil companies develop and test their formulations for a reason and when you blend two together you’ve just created your own formulation that has a mix of two.

What’s the difference between 75W90 and 80W90 gear oil?

SAE 75W-90 maintains a more consistent thickness, or viscosity, across a wide temperature range. It’s thicker when exposed to high heat and thinner under colder, wintry conditions than 80W-90. The use of 75W-90 gear oil is recognized by OEMs as a contributor to overall fuel economy.

What happens if you mix gear oil?

Therefore, mixing oil and grease will change the ratio of the base oil to the thickener, resulting in a lower consistency grade. Combine this with the issues of viscosity and oil incompatibility and you have a recipe for disaster when lubricants are mixed.

Is it OK to mix synthetic gear oil with regular gear oil?

Yes. There is no danger mixing synthetic and conventional motor oil. However, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits.

What’s thicker 75W90 or 75W140?

So, the difference between “75W90” and “75W140” is that at operating temperature, the 75W140 will be considerably thicker than the 75W90 but at room temperature they will be about the same viscosity.

Is Thicker gear oil better?

Higher viscosity provides a thicker film, higher wear resistance, and less deformation of the gears as time goes on. Low viscosity oils, on the other hand, are best for high speed systems with lower load. They provide a thinner film and better cooling to match the higher speed of the gearbox in question.

Does it matter what gear oil you use?

After selecting the viscosity grade, the basic type of lubricant must be chosen. While there are many variations, gear lubricants can generally be placed into three categories: R & O, antiscuff and compounded. The gear lubricant type that best fits a given application will be determined by the operating conditions.

What’s the difference between ATF and gear oil?

The simplest answer to the difference between transmission fluid and gear oil is in the purpose for which they are designed. Transmission fluid is engineered to work with automatic transmissions, whereas gear oil is typically intended to work with manual-type gear boxes.

What is the difference between GL-4 and GL-5 gear oil?

The main difference between GL-4 and GL-5 gear oils is the amount of EP additives. GL-4 is suitable for hypoid gear service when they are under severe service but are without shock loading. GL-5 is suitable for hypoid gear service under severe service and shock loads and not for use in a gearbox.

What does GL-5 mean in gear oil?

A GL-5 grade oil has a very high rating for EP (Extreme Pressure) protection. EP gear oils contain additives that prevent metal surfaces from cold welding under the extreme pressure conditions found in situations where boundary lubrication prevails. This is normal and acceptable in all steel gears.

What is 80w90 gear oil used for?

Application. Gear Oil 80W-90 is designed for use in differentials, both hypoid and limited slip, manual gearboxes, transfer cases and transaxles in passenger cars, light commercials, 4WDs, trucks, construction, earthmoving and agricultural equipment, where this viscosity grade is required.

What happens if you use the wrong transmission fluid?

Using the wrong fluid can cause poor lubrication, overheating, and possibly transmission failure. A mechanic might not be able to reverse the damage, even by flushing the transmission. Mistakenly adding motor oil or brake fluid can also destroy your transmission.

Can you mix Type F and Dexron?

As to ATF, no problem mixing Dexron and Type F, one can actually fine tune shift harshness as Type F is in fact “grippier”.

What oil goes in the gearbox?

Synthetic gear oil is chemical-based gearbox oil made up of polyalphaolefins (PAO), esters oils or polyglycols. Synthetic gear oils are multigrade and have every preventive additive included as part of its makeup. This gearbox oil can be run at extremely high or low temperatures.

What is the thickest gear oil available?

The SAE grading system indicates oil viscosity in simple numbers ranging from the thin oil (10) to the very thick oil (140 or above). Heavier weight, or higher grade oil is more viscous and therefore thicker as it flows between the gears. Light grade oil is ideal for small, fast, polished gears under a light load.

Can you mix royal purple gear oil with other oil?

Yes, you will have no problem. I mixed a quart of Mobil 1 with my Royal Purple crankcase oil. As long as they’re the same weight, they’ll “play nice” together.