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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 01-12-2013, 05:06 AM   #1
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Oil cap

I have white curd in my oil cap but no coolant leak and no white curd in my dip stick any thoughts guys
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Old 01-12-2013, 05:53 AM   #2
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If that might be described also as yellow foam, then don't worry about it. You probably just need to drive the car longer to remove water from the oil. It gets hydrogenated (not sure that's the exact scientific term)...but usually that's all it is.

Water vapor getting into oil from the intake air, fuel tank, and if the car isn't driven long enough, the engine hasn't burned it all off...

Pretty common and usually nothing to worry about. If it seems bad, try using techron (fuel system treatment), going for a long drive, and failing that, look into CCV issues.
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Old 01-12-2013, 08:54 AM   #3
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Thanks for your input mate will keep an eye on it
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Old 01-12-2013, 09:47 AM   #4
Zero. Leaks.
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How long are the drives that you take with the car?
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Old 01-12-2013, 11:38 AM   #5
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Not long I only work about 10 minutes from home and I just drive it in and out of town wich is about half hour away
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