Some Simple Facts about Transmission Fluid

What is the Difference between Motor Oil and Transmission Fluid?

Motor oil is used to deal with the combustion of the engine and to keep the engine cool, and it needs to be changed at least once a year if not more often. Transmission fluid is needed for the transmission system cool, but it is a closed system that needs to be changed far less frequently than motor oil.

Are There Different Types of Transmission Fluid?

There are automatic transmission fluids and manual transmission fluids, and some modern manual transmission systems may even require automatic transmission fluid (ATF), so be sure to check your owners manual or call your local service center to make sure you are getting the right kind.

There are also synthetic and traditional transmission fluids. Traditional transmission fluid is made with crude oil, and synthetic transmission fluid is made from specific chemical reactions that make it less likely to oxidize or break down in extreme heat.

What Does Transmission Fluid Look Like?

Transmission fluid is viscous and slick like motor oil, but it is dyed a dark translucent red color to help identify it. If it starts to turn darker or becomes black, it’s time to change your transmission fluid.

What Does Transmission Fluid Smell Like?

Transmission fluid has an odor similar to petroleum. If you notice it smells burnt, that means you should change your transmission oil soon.

How Do I Check My Transmission Fluid?

It’s smart to check your transmission fluid levels and condition about once a month to catch any issues before they become serious:

• Turn your vehicle on and make sure the engine is warmed up before checking the fluid. Under the hood, find the transmission fluid dipstick, which is usually to the right of the motor oil dipstick on front-wheel drive models.
• Use the dipstick to check the fluid level and make sure it reaches the “full” mark. Use a funnel to add more fluid if needed.
• Check the appearance and smell of the fluid to make sure it doesn’t need replacing.

How Often Should I Change My Transmission Fluid?

If there are no issues you notice when you check your fluid, you should replace your transmission fluid between every 50,000 and 100,000 miles, depending on the age of your cars, type of transmission, and driving conditions. Be sure to check your owner’s manual for more specific details.