Can I Use Engine Oil as Gear Oil? (What’s the Difference?)

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Written By Nicklaus Frost

Last Updated on: 3rd July 2022, 05:45 pm

A set of gearboxes need ‘Gearbox Fluid’ for the proper transmission work. The engine oil has detergents and a higher level of anti-oxidants, which is not required in gearboxes. Some two-wheeled vehicles such as motorbike and agricultural machinery have crankcase between the engine and the transmissions. You can use engine oil like gear oil in these vehicles.

If the most common gearbox oil or transmission oil has the same viscosity as the engine oil, then both oils need anti-wear additives about the same. For example, Toyota 75w-85 gear oil and the Nissan 75w-85 gear oil have the same viscosity as 5w-20 engine oil. The gear oils have sulfur/phosphorus additives as EP protection, and Carfictions experts call them slightly acidic. You shouldn’t place such gear oils in an engine.

Some Manual Transmission Fluid (MTF) has formulations similar to engine oils. But, we have noticed these fluids are a little more vital on EP and don’t get synchronized as expected.

As we have mentioned earlier, as two-wheeled vehicles, most motorcycles use one oil for submerging in the clutch grabbing capability. Mini classic cars have a mini manual gearbox that also requires single oil for the gearbox and the engine.

Will gear oil hurt an engine?

Your vehicle faces undue wear during the engine’s start. The technologist says that gear oil is much more viscous than engine oil. For being sticky types, the gear oil takes more time to reach crucial parts of the engine. During winter days, the situation gets worsen as the cold starts. The engine oil and gear oil has a different name for different viscosity. You shouldn’t use gear oil for the engine. It will damage your engine. Why face starting problems for free? Using engine oil to the engine will ensure minimum wear as such oil reaches every part of the engine very quickly.

What’s the difference between engine oil and gear oil?

Owning a vehicle has a long list of responsibilities. Checking brake fluid, engine oil, and gear oil are the prime maintenance factors to identify vehicle’s performance and efficiency. It would help if you used specific fluid in a particular space. Like all multiple lubricants or oil, you shouldn’t use the same things in small and large vehicles. Here, we show the difference between engine oil and gear oil. Have a blink of ‘EYES!’

What is engine oil

What is engine oil?

Engine oil is also known as motor oil or engine lubricant. These oils are designed with various additives and base oils to lubricate the inner components of an engine. The internal combustion engines remain protected against corrosion and high temperature when we use engine oil regularly and adequately. Without proper lubrication of an engine’s moving parts, it’s never possible to clampdown built-up heat. For an instant solution of engine functionality, we often use engine oil to protect engine parts against wear. It is to know that engine oils have their grade and viscosity. They can either be single-grade or multi-grade on the engine’s temperature. A multi-grade oil is most prevalent today. Make this type of oil compatible with various conditions. Engine oil like single- and multi-grade oils are measured on the same flow-rate and viscosity grade scale. Check out the world’s best 5w30 synthetic oil on Amazon.

What is gear oil?

None wants compromising transmissions, transfer cases, and differentials in vehicles. You are one of them, aren’t you? Gear oil is a lubricant that is made for these components. Using the gear oil in automobiles is like cutting costs for lubricating gear system. It prevents damaged wear debris and stops the level of noise from gear contact points. You never will find other alternatives to use in the gearbox. Gear oil is often mixed with additives and prevents rust & corrosion inhibitors momentarily. Check the world’s best-selling full Synthetic Gear Oil on Amazon.

What is gear oil

Q/A Session of ‘Engine Oil’

  • What to do if engine oil is low

What’s the next step after finding the engine oil low? It is a sign that you need an oil change instantly. We have discussed the necessity of engine oil, and changing it matters a lot to have maximum engine performance. You’ll find well-grade of engine oil on the market.

  • Why does engine oil level decrease?

We have found ‘Engine Oil Leak’ as the foremost reason that decreases engine oil level. You’ll find your car running well during this time and will find the low oil pressure light off. Still, if you check the oil level with a dipstick, you’ll find the oil level decreased! Surprising, right? It happens if a small leak in the engine occurs.

  • how to reduce oil consumption in engines

You must take a step to reduce hidden oil consumption in engines. Positive seals of a vehicle control emissions and oil flow. Such kind of seals minimizes oil consumption and hydrocarbon emissions. The engine gets dirtier and dirtier over time. Be mindful of using a premium Fuel System Cleaner to remove contamination from the fuel system.

 Q/A Session of ‘Gear Oil’

  • Where do you put gear oil in a manual transmission?

It’s essential to put gear oil back into the gearbox. You need an oil pump to use for that! Start filling into the filler. You’ll be notified of the level of the filler if driving a modern car.

  • How often to change gearbox oil manual?

Our experts tell us to change the gearbox oil manual between 40,000 to 75,000 kilometers. You can think of evolving gearbox oil filter at the same time.

  • How to know if gearbox oil is low

There are lots of signs to understand that gearbox oil is low. Still, You’ll experience problems shifting gears, slipping gears, and will listen to funny noises such as whirring, clunking, grinding.


Both engine oil and gear oil is like the lifeblood of the automatic system. You can’t deny one’s contribution in any event. You shouldn’t use engine oil like gear oil or gear oil to the engine oil. Be mindful of using the same oil to play similar roles. The gear oil lubricates and cools the transmission generously. On the other hand, the engine oil improves the slow gear engagement and clunking noises of the engine shaft. Let us know if you found us as useful as expected! Cheers.

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