Why refillable olive oil bottles are a bad idea
They look great on a counter. They're also one of the easiest ways to ruin a good oil.
Three things happen when you move olive oil out of its original packaging
Old oil left in the bottle oxidizes, and when you top it up with fresh oil, that rancid residue accelerates the spoilage of everything you just poured in. Cleaning an oil bottle properly is not easy.
Premium oils are often packed with a nitrogen flush to displace oxygen before sealing. The moment you pour it into something else, that protection is gone.
Most decorative dispensers are clear or semi-opaque. Light triggers photo-oxidation and accelerates spoilage. Original packaging is dark green, amber, or tin for a reason.
If you really really want a dispenser transfer only what you'll use in 3-5 days. Use dark or opaque glass. Get a spout that actually seals. Never top off wait until it's empty, wash thoroughly, dry completely before refilling.