Small Engines (Lawn Mowers, etc.): White Foam in John Deere L120 Engine Oil, john deere l120, crank case

Question

White foam Deere Dipst Hello-

I have a 2003 JD L120 lawn mower.  It has a B&S Intek 20Hp engine.  I have been using it this winter for snowblowing.  When I check the oil I see white foam on dipstick.  I changed the Oil, and now it's back again.  Last time I ran the engine I was getting some sputtering.  Any Idea how water I assume is getting into the crank case?

Thanks,
Steve

Answer
What weight of oil are you using?  Is the air filter in the engine?  Are there any o-rings on the dipstick or dipstick tube?

This is the first time I have heard of this problem.  It may be condensation but that is a lot of moisture.  Check to see if the o-rings are sealing.
Let me know what you find.  Again what oil are you using?
Eric