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White smoke/steam from oil cap

I noticed some white smoke coming out of the oil fill inlet the other day. I've checked a couple times since, and its has the steam/smoke every time. I got

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Old 10-02-2011, 03:59 PM   #1 (permalink)
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Default White smoke/steam from oil cap

I noticed some white smoke coming out of the oil fill inlet the other day. I've checked a couple times since, and its has the steam/smoke every time.

I got paranoid that perhaps my oil was frothing since it is right at the H mark on the dipstick (seems unlikely). So I drove around a bit and checked the dipstick within about 1 minute of killing the engine and found a lot of bubbles in the oil on the stick.

It seems like my oil level should be fine since its within spec though. Am I just overreacting? Could the white smoke mean I have a PCV issue? Bubbles on the dipstick normal? If it sounds like I'm clueless, its because I am with most car stuff.

I'm running redline 5w30 filled to 1mm below high mark on dipstick (was a little overzealous in pouring during last oil change )
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Old 10-02-2011, 07:26 PM   #2 (permalink)
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I don't think oil would boil even at 300 but what are your temps looking like?
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Old 10-02-2011, 08:01 PM   #3 (permalink)
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Oil temp hovered around 220 degrees today. Normal driving under 4k rpm in 78 degree weather (normal for my z unfortunately).

I don't mean to give the impression that the oil is boiling. Rather that it may be overfilled and coming in contact with the crankshaft counterweights which would whip it up into a froth, diminishing the oil's ability to lubricate. I doubt thats the case though since Im not above the High mark on the dipstick (unless the stick is as inaccurate as my mazda3's).
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Old 10-02-2011, 09:23 PM   #4 (permalink)
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I think you're supposed to check the oil after 15 minutes.
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Old 10-02-2011, 09:29 PM   #5 (permalink)
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I think that's actually normal... crankcase vapors.

Bubbles on the dipstick...? Does it look milky? That would suggest a head gasket leak, but it's probably fine.
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Old 10-03-2011, 07:08 AM   #6 (permalink)
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Lmao I have a mazda3 too. The dipstick is awful.
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Old 10-04-2011, 03:52 PM   #7 (permalink)
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Quote:
Originally Posted by MattP725 View Post
Lmao I have a mazda3 too. The dipstick is awful.
Isn't it? Good lord. The car is so solid other than that silly oversight.

But on the smokey oil cap and bubbly dipstick: I'm just going to let this one go lol. Trying to break myself of my perfectionistic and overly cautious car habits.

Jordo- It isn't milky, thank goodness

azn370z- I wait 15 minutes when checking the level but had heard that you can tell if your oil is frothing by checking the dipstick for lots of little bubbles within a minute of shutting down the car.
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