THIS Make darn sure you get the thing up to temp and drive it long enough to get rid of condensation. "Your weather" might be a factor.
At times, when I had the beat up old FJ-40 landcruiser, various SB Mopar, and aluminum rocker covers, that thing would generate a sort of white past-ish material up in the rocker covers and oil filler cap. It lived out doors which may not have helped and had a leaky, hood with no insulation.
