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Old 03-29-2010, 12:12 PM
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bustedbenz bustedbenz is offline
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Join Date: Feb 2007
Location: Lexington, NC or Boone, NC
Posts: 2,272
This is inadvisable, unless you're doing some kind of engine flush or something and draining very very young oil.

Just from an internal cleanliness perspective, I'd change the filter to a new one and run the old oil longer before I'd put clean oil through a dirty filter. As the filters plug up and collect trash, they become less effective. These diesels carry a heavy soot load in the oil, which further puts a strain on the filters to keep up.

I ALWAYS change oil and filter simultaneously no matter what engine I'm working on. But *if* I were going to do one and not the other, the filter change is perhaps even more important than the fluid change.

"What could possibly go wrong?"

~Michael S.~ -
1986 M-B 300SDL, retired due to rust and electrical problems. Donated engine to:
1987 M-B 300SDL, odo dead. New project.
1982 M-B 240D, odo stopped at 308,000
1982 M-B 300SD, 175,000
1989 Dodge Ramcharger, 87,000 - 4wd, 318
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