I drain the warm-to-hot oil overnight. You'd be surprised how many hours, literally hours, oil is still draining from the pan.
In the morning, I insert a cotton strip during the plug hole which is about 3 feet long, and allow it to soak. Then I remove it.
Every time I change the oil, which is every 3000 miles or 3 months (whatever comes first), I change the oil filter and refill with fresh Rotella Synthetic oil.

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Bernard
Ventura, Calif.

My current Diesels:
1995 Mercedes E300D SE
1992 Dodge D250 Ram with Cummins Turbodiesel
1985 Mercedes 300CD Turbodiesel Coupe
1978 Mercedes 240D (daughter's 1st. car)