Skip the auto shop - Our mechanics make house calls

Q: I used 5w-20 engine oil of instead of 5w-40 as recommended in the manual

asked by on

So I running low on oil in my 991 GT3 and so I stopped by the nearest gas station, quickly grabbed a Mobil 1 5w-20 and began pouring it in. Halfway into it I suddenly remembered it was 5w-40 and not 5w-20. I poured a little over half a bottle of 5w-20 inside. What kind of damage will this do? Can I simply just add 5w-40?

My car has 13500 miles.
My car has an automatic transmission.

The most important thing is do not run the engine low on oil even using a lighter weight oil. Since you did put in the incorrect oil I would recommend not running the vehicle too hard until you get the oil and filter changed. Your engine should use Mobile 1 0w40 normally for all temperatures.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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 used 5w-20 engine oil of instead of 5w-40 as recommended in the manual

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: Can I wait to get my oil changed?

Today's vehicles are generally capable of going between 5,000-10,000 miles between oil changes. I would recommend basing your oil change intervals on mileage rather than months due to fluctuation in mileage driven. You should be fine waiting until December to...

Q: 2 yrs old and needs a tranny???

While it not a common thing to have a low mileage transmission failure, it does sometimes happen. It may not necessarily be that the transmission failed as a unit, but a specific part may have failed and the factory recommendations...

Q: Steering fault indicated on the dashboard.

Hi there. Check the entire steering system for any issues that could cause the steering fault to illuminate on the dashboard. Look for signs of fluid leaks, broken lines, and listen for the pump as it is working. If the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...