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.

A: The most important thing is do not run the ...

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Should i just put oil in it

The oil maintenance reminder light on all Lexus models comes on when an oil and oil filter change is required. However, if you have not checked the engine oil level (on the dipstick) for some time, you should do so...

Q: Battery fully discharged

Your battery can discharge simply because it failed. If it has failed internally it will short and lose charge. In this scenario, the battery will need to be replaced. If the battery is fine then the problem is in the...

Q: Noise when starting the vehicle

Hello. The symptoms you describe are commonly associated with a faulty starter or a worn flywheel or flex plate teeth. When the starter is engaged a plunger extends and makes contact with the flywheel ring gear. If there is an...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...