Q: My mechanic serviced my 2006 Toyota Aygo semiautomatic transmission with synthetic motor oil. Should I be worried?

asked by on

My mechanic serviced my 2006 Toyota Aygo semiautomatic transmission with synthetic motor oil instead of regular ATF. He said the engine oil would not harm the transmission. Should I be worried?

My car has 219000 miles.
My car has an automatic transmission.

I would not recommend using motor oil in an automatic transmission. Automatic Transmission Fluid (ATF) can be petroleum-based, partially synthetic, or totally synthetic-based oil. All domestic automobile manufacturers require a petroleum-based fluid in their automatic transmissions. Some import manufacturers require the use of a partially synthetic fluid. ATF is a petroleum-based liquid compound that also includes special additives that allow the lubricant to better meet the flow and friction requirements of an automatic transmission which are much different than engine oil requirements. ATF is normally dyed red, primarily to distinguish it from engine oil when determining the source of fluid leaks. The main difference between the molecules in synthetically engineered ATF and conventional ATF are the uniformity of the molecules. The molecules found in most conventional ATF differ in shape, size and impurity. The type of ATF that should be used for a specific application depends largely on the driver’s driving habits, the environment in which the vehicle is driven, the type of transmission and the limits that the transmission may be pushed to. I would recommend having an expert from YourMechanic come to your location to perform a transmission fluid service on your vehicle to ensure you are getting the proper fluids in the transmission to avoid any potential damage.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My mechanic serviced my 2006 Toyota Aygo semiautomatic transmission with synthetic motor oil. Should I be worried?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car won't start, clicking sound

This sounds like you may have a failing starter solenoid. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity to the starter. When this fails, it may cause a clicking sound and will...

Q: After change taillight and evaporation purge valve on 06 Cadillac SRX will not crank over or attempt to start key lock in ignitio

Hi Anthony. While we appreciate the question tonight, I'm not sure how we can help in this case. Anytime you install used parts on a vehicle, you're going to risk having compatibility and connectivity issues. If the power was not...

Q: My Toyota Avalon 2004 turned off when I put on drive.

This type of incident can sometimes reflect a "one-off", and usually inexplicable "glitch". There is of course a possibility the incident reflects an incipient failure. It is possible to use various scan tools and diagnostic tests to gauge the present...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.