Q: Is it bad to over-fill engine oil?

asked by on

Is an over-filled engine oil bad? I've had my Mazda taken to the dealership for fluid replacement and each time I noticed that the oil level was above the second mark.

Yes it is bad. Engines are made for a certain amount of oil. If you put too much oil, it takes up space that wasn’t taken up before and can cause compression problems that can blow seals out.

You’d want to empty it out so that it’s just at the full level and go someplace else to get your oil changed, because will need to be at the full level. That’s what a pro does. I always look them up. I don’t even trust a gas sign. I look at my computer and if it says 3.4 quarts, I put 3.4 quarts. You want to be a pro when you’re changing it and not put the wrong amount in because it can ruin it.

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. Is it bad to over-fill engine oil?

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: Engine Oil (Not transmission fluid) leak behind the bell housing.

Hi there. The oil pan, oil filter, or the rear main seal (rear crankshaft seal) could be leaking. Check the oil filter and make sure that it is on tight. Then take a socket and wrench and check all of...

Q: Can you car still run if the ac compressor belt breaks

Hello. The car will not successfully run without a serpentine belt. The car may continue to run for a moment if the ac compressor belt breaks, but not for long. The belt also powers the alternator, which supplies engine with...

Q: Rear differential seems to be leaking. 2001 BMW M3

Hello - there are several possible sources of a differential fluid leak: the pinion seal, the axle flange seals, or the rear differential cover gasket. I recommend an oil leak inspection performed by a mobile, professional mechanic, such as one...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.