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[MadMark73]

Hi. Just a small problem. I have found a small amount of 'mayo' in the oil filler neck. Is there any known problem that is likely to be causing this. There is no oil in the water expansion tank. Thanks, MadMark73.

[Doodley]

have a search for head gasket, or mayo. its a common topic!

if you drive on a moorway trip it will probably vlear! and hello!

[Mike_T]

Hi, This is normaly caused by condensation building up in the cam covers due to the engine not reaching working temperature frequently enough. Short runs will not help this situation.
Does the engine take a long time to reach normal temp ? if it does then you could have cirulation or themostat problems.
Mike.

[Marks DTM Calib]

Ok.

On a V6 it is NORMAL!

Reason:

When you burn fossil fuels you get water as a by product. As all pistons engines have some blow by gasses past the rings (even when new) you get some water that gets into the crank case.

This then evaporates off when the engine is warm.

Most goes through the crak breather system but, there is one other high spot it can gather and this is in the oil filler neck.

On most cars, the oil filler gets oil wash from the cams rotating but, on the V6 the oil neck is extended to improve access for oil filling so it does not get washed by the cams.

So you get condensed water mixed with a bit of oil the result of which is what you are seeing.

Notes:

1) If you go on a longer journey the engine and bay get much hotter and the mayo tends to disperse

2) Some oils are more prone to causing the condensate than others.

So, worry yeh not!

[Dazzler]

Ok.

On a V6 it is NORMAL!

Reason:

When you burn fossil fuels you get water as a by product. As all pistons engines have some blow by gasses past the rings (even when new) you get some water that gets into the crank case.

This then evaporates off when the engine is warm.

Most goes through the crak breather system but, there is one other high spot it can gather and this is in the oil filler neck.

On most cars, the oil filler gets oil wash from the cams rotating but, on the V6 the oil neck is extended to improve access for oil filling so it does not get washed by the cams.

So you get condensed water mixed with a bit of oil the result of which is what you are seeing.

Notes:

1) If you go on a longer journey the engine and bay get much hotter and the mayo tends to disperse

2) Some oils are more prone to causing the condensate than others.

So, worry yeh not!

Now thats what i call an explenation

[MadMark73]

Thanks to all who answered. A sensible answer from a very helpful site.