I've seen milky oil filler caps in a 01 VW Jetta, 2 separate E36's, and a 01 Ford sport trac. All just from doing short tips in cold weather, no blow HG's. When the dip stick looks milky, then you got a problem.
Also, coolant loss could be leaking hose or a HG leaking externally, etc. Unless you are getting that milky substance on your dip stick then you're fine. Do a compression test and/or leakdown test if you'd like, because it will let you know before you're dipstick gets milky, because once it is the water in your oil could have damaged the main bearings and such.
Last edited by Jakobie1086; 01-18-2013 at 07:13 AM.