my 5.4 3v has milky stuff under the oil cap, now i always assumed this isn't that big of a deal since its the coolest place on the engine and condensation forms etc. but my question is since my week consists of 6 miles to work 6 back and every Friday i do a 40 ish mile drive for fun and to warm the fluids up shouldn't there really be no condensation forming at all since im heating things up real good? would it be better if i drove on the highway instead of around town?