Depends on how oily you like your engine. The rubber insert is rock hard and shrunken, allowing vapor to deposit oil on the valve cover.

Get a new tube, elbow, and grommet -- you are going to break the old one getting it out, they are VERY brittle by now.

Replace the oil filler cap while you're at it, they leak too.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!