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What is that milky fluid on my RX-8's oil dipstick?

Question:

I found a milky fluid on my RX-8's oil dipstick - what does that mean?

Answer:

This milky substance does not affect engine performance or any other functions of the vehicle. During cold weather, moisture contained in blow-by gases (exhaust, oil, fuel, water vapor) is cooled by the intermediate housing wall and condenses due to difference in temperature. A chemical reaction between the moisture reacts and the engine oil in the intermediate housing will yield the milky fluid. This fluid then eventually dissipates
as the engine warms up to full operating temperature.

The milky fluid does not affect the quality of the engine oil and therefore the engine performance is not affected either. Mazda has verified that the amount of moisture in the oil is within the acceptable standard for motor oils commonly found in the market.

However, you should verify that the coolant reservoir is full and that there is no sign of engine coolant leakage.

You can also go to you Mazda dealer and ask for a new oil level gauge tube plastic insert which has been developed as a countermeasure to keep the milky substance off of the dipstick (however, the substance will still be in there- it's a cosmetic fix only).


Generated 20:00:49 on Jan 18, 2017