No, you cannot refill an Oxbar vape. Oxbar vapes are designed as disposable devices, meaning they come pre-filled with e-liquid and are intended to be used until the e-liquid or battery runs out. Trying to refill a disposable vape like Oxbar can damage the device, affect performance, and potentially be unsafe. If you're looking for a refillable option, it's better to explore pod systems or vape mods that are specifically made for refilling.