You should change your transmission oil (commonly referred to as transmission fluid) every 50,000 to 70,000 miles to keep the transmission of your '99 Toyota Corolla in good working condition. Transmission oil is very thin and, as it is exposed to the heat of the working gears, it will lose its viscosity (ability to coat and protect gears). You can change your '99 Toyota Corolla's transmission oil in about an hour with a few basic tools and transmission fluid, regardless if you have a manual or automatic transmission.
- Skill level:
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Things you need
- Drain pan
- Socket wrench
- 10mm Allen head socket
- 3 quarts transmission fluid
- Clean rag
Park your Toyota Corolla on a level surface.
Locate the transmission drain plug. The plug will be on the driver's side of the transmission, near the bottom of the transmission case.
Place a drain pan under the drain plug. Remove the plug using a socket wrench and 10mm Allen head socket. Let the transmission fluid drain out completely. Replace the plug and tighten it hand tight, then turn it 1/4 turn more.
Raise the engine bonnet and locate the transmission fluid fill spot. It will be on the passenger side of the Corolla to the rear of the engine block and will be labelled "Transmission." Remove the cap and dipstick.
Pour two quarts of transmission fluid into the fill spot using a funnel. Replace the dip stick and cover.
Start the engine and let it warm to operating temperature.
Shift up through all of the gears and then back down again. Leave the engine running while you go on to the next step.
Remove the transmission dipstick, wipe it clean with a rag and return the dipstick into the fill spout (all the way) before drawing it out and reading the amount of fluid on the stick. If your dipstick is not reading "Full," add a small amount of transmission fluid.
Repeat Steps 7 and 8 until your transmission dipstick reads "Full."
Tips and warnings
- Add the transmission fluid in small amounts. It takes very little to reach the correct levels and if you overfill, you will have to drain the system again..
- Always check the transmission fluid levels with the car running and after you have shifted through all of the gears, in order to get an accurate reading.
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