What is the difference between ATF and gear oil
Isabella Harris
Updated on April 10, 2026
Gear oil is also thicker than ATF because it serves mainly to lubricate the gearbox, transfer cases, and differentials. … ATF does not have the thick lubrication qualities needed in a manual gearbox, and gear oil does not contain all the additives needed to smoothly run an automatic transmission.
Can you mix ATF and gear oil?
While technically they will mix, they are very different and should not be mixed. ATF is thinner than most gear oils, so you will reduce that protection.
What is ATF oil used for?
Automatic transmission fluid (ATF) is a kind of transmission fluid used in vehicles with self-shifting or automatic transmissions. It is typically coloured red or green to distinguish it from motor oil and other fluids in the vehicle.
Can I use ATF in manual gearbox?
If you drive a vehicle with a stick shift, you might wonder if automatic transmission fluid will work in your manual transmission. … You might wonder if you can use Dextron-III/Ford Mercon multipurpose automatic transmission (ATF) instead of motor oil. The answer is a qualified, “Yes.”Can I put gear oil in my engine?
If you have added gear oil to the engine, GET IT OUT AS SOON AS POSSIBLE. Gear oil has sulfur/phosphorous additives that will cause extra wear on your bearings, valve guides, and severely depress your anti-acid formula. Motor oil is alkaline, gear oil is acidic. they should not be mixed.
What is the difference between MTF and ATF?
ATF is very thin, and is more of a hydraulic fluid. Some manual trannys and transfer cases call for the use of ATF. However, Honda manual transmissions call for Honda MTF (Manual Transmission Fluid) or 10W40 Motor oil.
Is transmission fluid an oil?
Unlike engine oil, which is primarily a lubricant, transmission fluid serves as both an oil and a hydraulic fluid that helps facilitate gear shifts, cools the transmission and lubricates moving parts. … Transmission fluid often is red but can come in other colors, and as it deteriorates it tends to turn darker.
What is ATF oil BMW?
Pentosin ATF 1 is a fully synthetic high performance Automatic Transmission Fluid (ATF) for life-time application in automatic gear boxes. Pentosin ATF 1 is formulated by means of the best commercially available synthetic base oils and additive components.What is ATF made of?
Traditional Transmission Fluid. While traditional transmission fluid is made from crude oil and the reshaping of hydrocarbons for specifications of different vehicles, synthetic transmission fluid is created through different chemical reactions.
What is ATF fluid for a BMW?The recommended ATF for either is Dexron III (D4). This is also the most common ATF you will find at auto parts stores (it’s compatible with most GM and Ford auto transmissions). BMW has transitioned to a newer Dexron VI spec, which is backwards compatible with Dexron III.
Article first time published onWhat viscosity is ATF?
Temp. [°C]Dyn. Viscosity [mPa.s]Kin. Viscosity [mm²/s]0217.29247.3910118.06135.422070.0480.933044.7052.04
What can you use instead of gear oil?
- Manual Transmission Fluid (MTF) An obvious substitute for the American Petroleum Industry Gear Lubricant (API GL-4 or GL-5) typically used in your vehicle is an appropriate MTF for your make and model. …
- Automatic Transmission Fluid (ATF) …
- Motor Oil.
How can you tell the difference between gear oil and engine oil?
The main thing you’ll notice about gear oil is its viscosity. It’s much thicker than motor oil, with an average motor oil being 5W/30 and the average gear oil being 75/90 (see this article for in depth explanation of oil viscosity index).
Is gearbox oil thicker than engine oil?
Engine oil and gear oil both are basically used as lubricants. Engine oil is thinner and gear oil is thicker.
Which transmission fluid is best?
Our top pick for the best transmission fluid is the Castrol Transmax Dex/Merc ATF. It works for the majority of domestic cars out there and delivers great results. If you’re looking for something even more wallet-friendly, check out the ACDelco Dexron VI Synthetic ATF.
What color is transmission oil?
Many vehicle fluids have been dyed for easy identification, and transmission fluid is no exception. Newer transmission fluid is a translucent dark red color, but over time, it will become even darker through use.
Is ATF mineral oil?
ATFs are made up of either mineral, semi synthetic or full synthetic base oils plus additives depending on the application and the manufacturer requirement. Earlier fluids were made from mineral base stocks while later fluids are made from mineral, semi synthetic or full synthetic base stocks.
Is ATF A good lubricant?
In my general experience I’ve found that ATF is usually the best lubricant for almost any purpose, for example I’ve found that ATF lubricates air tools better than air tool specific lubricants.
Is ATF good for power steering?
Yes, you can. You can use ATF or automatic transmission fluid in your power steering pump as a substitute for power steering fluid when you’re in a bind. … Many cars and trucks actually require ATF in their power steering pump. Read your vehicle’s manual to see if this is the case for your make and model of automobile.
Does BMW recommend transmission fluid change?
Your BMW’s transmission fluid is supposed to be replaced between every 30 to 60 thousand miles, and if it isn’t, then it may start to smell.
What is ATF oil only mean?
Transmission oil is not a regular oil, but rather a cocktail with very different ingredients. Therefore, the acronym ATF (automatic transmission fluid) is used in English. … In order to avoid confusion, we will use the more palatable word automatic transmission oil instead of the word fluid.
Is BMW transmission fluid lifetime?
The fluid BMW uses is also known as lifetime fluid (not forever fluid). This fluid is less prone to chemical and viscosity break down compared to conventional oil. … It was 3 to 4 times more expensive and it was suitable for up to 100,000 miles.
How much does it cost to change the transmission fluid in a BMW?
BMW 325i Transmission Fluid Change Cost Estimate. Labor costs are estimated between $148 and $187 while parts are priced at $122.
What kind of transmission fluid does a 2000 BMW 323i take?
Valvoline Transmission Fluid Dexron/Mercon 1 Gallon.
Is all transmission fluid the same?
Always check your owner’s manual for the type of fluid recommended for your vehicle by the manufacturer. Most, but not all, transmission fluids are blended with synthetic base oils to offer better performance, with improved resistance to heat, cold, oxidation, friction, and shearing.
Can I use ATF as brake fluid?
No, you can’t EVER substitute ATF or any other petroleum product for brake fluid. The rubber parts will be damaged almost immediately and the entire system will have to be disassembled, extensively flushed and all parts with rubber components rebuilt or replaced.
What is 90w gear oil?
These are the mineral base gear oils that include no excessive pressure additive and that can be applied to all gearboxes.
Is Thicker gear oil better?
As a general rule high viscosity oils are best for low speed, loaded gears with a rough surface. 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.