What about the oil route as well? I purchased the EZ Oil Drain Valve Kit from DPNW, so I figure I could pull the drain plug and install that and get at least some idea of the quality of the oil. I don't recall offhand if I need to drain the oil fully to install that plug or if I can sorta do it quick enough to get it back on without causing too much of a mess. I suspect with the engine cool the oil & water will have separated back out, so I guess I probably won't know if it's 'milky' until I drain it empty, or perhaps run the engine for a few minutes to mix it up?