I have an Ariens 17.5HP riding mower that is used as a put-put to haul things around the yard, get the mail, etc. The oil looks normal when I check it prior to starting the engine but if I check it again after running a few minutes the oil seems to have a foamy "head" on the dipstick. I suspect it is condensation from being run for relatively short periods in cold weather.
I tried taking a photo of the dipstick but the foam seems to disburse rather quickly. In the photo below you can see a small patch where the dipstick is bent in a zig-zag. If I check the oil immediately after stopping there is about a 1/4" band of white foam at the full mark. The engine oil is full and recently changed which is why it doesn't show very well on the dipstick.
To aid warming when running during the winter I have installed my DIY cold weather kit on the top of the engine. Is this foam something I need to worry about and if so, is there anything that I can do to get rid of it other than changing oil again? Will running the engine a long time and getting it really warmed up get rid of what is already there?