I'm replacing the oil-pump chain, sprocket and tensioner rail on a
380sl I'm rebuilding, and I'm debating whether to replace the oil
pump, too, even though the existing one still looks and works fine
after about 180k miles. On the one hand, I understand that these pumps
hardly ever fail, and i've already spent way more than I had
anticipated redoing this engine. Otoh, the last thing I need is for
the pump to fail after I get everything back together again. So any
advice would be appreciated.

If I do decide to replace the pump, I was also wondering whether to go
with the OEM version or a much cheaper Febi-Bilstein. So if anyone
here has had any experience with the latter, I'd appreciate hearing
about that, too.

Thanks in advance.