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.

__________________


http://www.appstate.edu/~salleyms

"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