Sorry if this is a silly question.

I had a valve adjustment done by a great indy about 6000 miles ago (about 3 years or so) and a new mercedes brand valve cover gasket was put on. never has leaked, all good.

I'm going to do a valve adjustment myself soon, and I'm wondering - must I replace the valve cover gasket? I have both a no-brand and a Mercedes genuine on hand, but if its working, and the gasket is only 6k/3 years old, can I just leave it?

Thanks all,
-Andrew

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Andrew
Montclair, NJ
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1982 300D Turbo
120k
Petrol Blue Green