I caught my heart in my throat late this afternoon...this looks like water contamination to me (milky residue under the cap)... should I get an analysis (long wanted to--but never have) or should I get it in for a compression test or some such??
Right. Crankcase gases in the long neck cool off, allowing water vapor to condense there. My '72 Subaru did that badly in cold weather, for that reason.It's normal in the winter, especially when short hopping and/or with cars that have long oil fill necks. ...