Q: I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc But I found out that the right oil is 5W30 or

asked by on

I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc 2009 model But I found out that the right oil is 5W30 or 5W40 so I want to find out if I change to the right oil will it cause my engine to start smoking?

My car has 105700 miles.
My car has an automatic transmission.

Hi Justin. Thanks for taking time to contact us today. First off - don’t worry, you’re not the first person to make this common error. Although higher viscosity engine oil is not always the best way to protect an engine, it’s not too harmful either. In most cases, the biggest symptom that will occur is that oil pressure will be higher than normal, which would have triggered the check engine or oil pressure light on your dash if a problem existed. If this has not happened, then it is likely that making the change to the recommended 5w30 should not cause additional problems. The only thing that would cause smoke is if piston rings or cylinder head valve guides were damaged slightly due to the higher viscosity oil - but I would not worry too much about that. Just make sure to change your oil and oil filter at the same time, and you should be fine.

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. I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc But I found out that the right oil is 5W30 or

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: steering wheel very stiff even after fluid was added

Hello. There could be a problem with the power steering pump leaking, one of the power steering hoses leaking, or the rack and pinion leaking. Those would be the 3 major culprits that could be causing issues. Have the entire...

Q: Q: Over heating

If you have really found evidence of cooling system blockage(s), then your continued overheating could simply be due to the fact that not all blockages are yet removed. Also, you could have multiple faults, that is blockages plus perhaps a...

Q: After oil change, engine stutters, warning lights on

Hello. EPC stands for electronic power control, and the light is seen when there is a fault with the throttle body, traction control, throttle pedal, or cruise control systems. It is flashing because the car's computer can not compensate for...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.