Mayonnaise - what causes it on these engines?

[Stevepd]

Did my weekly oil check today and wiped away the little mayonnaise that was present on the oil filler, but for the first time since I've owned the car I had mayonnaise on some parts of the dip stick. No I do a 32 mile each way trip to work mainly sat at 65-70 and have no trouble with the car not getting hot. I don't/haven't worried about the filler gunge before but being on the stick....... It was cold here every day last week at no greater than zero during the day plus I was on earlies so it was getting started and driven in the minuses.

Do we know why these engines go mayonnaisey in the cold?

[th3_f15t]

I take it your coolant level isn't dropping as well? Or your oil level? Hopefully just the trapped moisture from where it's below freezing at night but certainly monitor your fluid levels and keep an eye on the exhaust smoke colour too.

[Beddie]

Same as any engine really, emulsification of the engine oil which is always made worse by cold weather conditions 
It'll always come and go on the TFSi depending on weather/journey conditions

[PT82]

Mine has been standing for two weeks and since Friday has had three 12 mile round trips to and from work. Cleaned car today, also checked fluids and oil. All were spot on. I had a little Mayo on oil cap and dipstick. Dipstick was a first for me also. Car needs a bloody good run!

57 reg, 36.000 miles.

[Stevepd]

I take it your coolant level isn't dropping as well? Or your oil level? Hopefully just the trapped moisture from where it's below freezing at night but certainly monitor your fluid levels and keep an eye on the exhaust smoke colour too.

Yep, no coolant consumption and only uses a trace of oil. I'm wondering if it's not a case of it getting warm enough but perhaps part of the cooling down in the cold temps, as with most of us I have zero Mayo in the summer or warmer months.

Currently on 106k

[Matthewsimone]

Mine does this also (very frustrating) uses no water and a little oil which is very normal for tfsi engine so im told!

Surely it has to be a issue with the breater system on this engine as my wifes gt tdi 140 doesn't do it and neither have any of my previous cars some of which were £400 banger runabouts and never a trace of mayo regardless of weather!