although mine isn't a cos it's the same, i too am putting it down to the weather as it was fine in the summer and isn't using alarming amounts of water.

my mayo [ooer] is only in the dipstick tube and rocker box aswell, so although when you remove the dipstick you think the sump is full of white shite which is gonna bung up oil galleries but it isn't, well not on mine anyway.

i also do alot of short journeys throughout the week but do try to give it a gentle blast at weekends which results in no shit on the dipstick, but usually a engine bay full of oil from a split breather or something, now it's getting a bit depressing and i tend to not open the bonnet unless i really have to - this is gauged depending on size of oil patch left on the driveway in the morning!