Question about 2004 Mazda RX-8

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Milky colored oil on dipstick 2004 mazda rx8 - 2004 Mazda RX-8

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There are no head gaskets on a rotary engine and the milky colored substance is normal for a rotary engine mazda has a TSB out for this concern

Posted on Jun 02, 2009

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May also just be condensation in your oil. Do a complete oil change if you feel comfortable doing so, after you do the oil change do not start the vehicle, crack you drain bolt again allowing some oil to run out. If the oil starts to clear up and return to its original color then it is just condensation. This has happened to other vehicles that I have owned and is an easy fix, however if this is not the case then unfortunately it is the pricey issue stated above

Posted on May 29, 2009

  • staffordmazd Apr 14, 2011

    The milky substance is definately condensation and is normal. Mazda do have a fix but its
    expensive. It won't have any detremental affect on the running of the car.

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Hi, This is not a good sign here. this is signaling a really bad issue with one or both of the head gaskets. your coolant is mixing with the oil content and, this can cause major block break down if this isn't corrected ASAP.

Watch your temp while driving this car for long periods of time.

Posted on May 17, 2009

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  • Michael Masters
    Michael Masters May 17, 2009

    HI again, after further research, i have found that this engine is a rotary design and this is a rear main seal issue that is allowing the coolant to mix with the oil. i apologize fo the original solution.

  • Michael Masters
    Michael Masters May 17, 2009

    for**

  • Mukunda Modell
    Mukunda Modell May 01, 2013

    it's not coolant. Foamey dip stick is totally normal on an rx-8

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1 Answer

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the is no headgasket on a rotary engine....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
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How much oil should be on the dipstick for 2004 RX8? Do you read the level on the dipstick the same with any other car?


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When you put the dipstick all the way back in (lined up with the V-notch on the cover), it reads over full. When you don't line up the V-notch, and just do a quick dip, with the notch keeping the dipstick from going all the way in and sealing the hole, it reads the correct level.

See page 12 of 12 in the .pdf file from Mazda
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6 Answers

Whiteish gunk on oil dipstick


I also have an RX8 with this... problem the problem is that most of the people that are giving you these... expert solutions couldn't find their own *** with two hands and a map. Any way there is no problem your mazda has a rotary motor this whitish gunk is normal your car naturally burns oil and with the way the motor is designed this is normal. you should be more worried if you don't see this on your dipstick after running your car.

Feb 02, 2009 | 2005 Mazda RX-8

3 Answers

Whiteish gunk on oil dipstick


Wankel Rotary engine guys no headers or gaskets

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
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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).

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1 Answer

Mazda RX8


It usually is evident. It may sound odd, but if you take out the oil dipstick and smell it, you should be able to smell gas if it's in there. I would still recommend changing the oil just to be safe. Fuel in the oil could ruin the apex seal on the rotors and repairing that will cost alot more than an oil change. Also make sure that whoever changes it uses 5W-20 Non-synthetic oil. Synthetic oil will break down parts in the engine. I hope I could help.

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