Mazda 5 engine oil level rising for no apparent reason help !?

Make sure you're checking the oil correctly. Do it only when the engine is cold and you're parked on a level surface. If you're positive the level is increasing and no one has added any oil (ask the other drivers, your mechanic, etc!), then you've got a problem.

A leaking head gasket is the likely culprit, but there could be other explanations. If you're still under warranty, take your car to the dealer and have them take a look. If you're not under warranty anymore, take your vehicle to a good independent mechanic.

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Answer:
Drain your oil. Check to see if it is a milky white. If it is, you’ve a bad head gasket. You would notice the bad head gasket while driving, it would be smoking a lot. If the oil is just typical brown, just change your oil filter and replace with the correct amount and no more. Most new oils are so clean they are clear on the dipstick. This causes people to think their oil is low and they unknowingly are adding too much oil because they cannot see it on the stick.

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Answer:
omg you should check the oil level when the engine has been stop for a while, not while the engine is on or short after you turn it off

park it in a straight surface and take the level

unless the engine is mixing the water with the oil there’s no any possibility in this world the oil level rise

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Answer:
Uh-oh! Check the underside of the filler cap. Is there a whitish foam/froth/cream? You head gasket has gone and is allowing water into the lubrication system, including the sump. That's why your oil level is going up not down! (Oil floats on water). Check the radiator too (when it's cold). Does the coolant look like there's an oil slick on top? Same problem, different symptom.

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