Can oil refilling avoid oil replacement?

No. The lubricant must be replaced according to the recommendation indicated by the manufacturer. Oil degrades over time because it is subjected to high pressures and temperatures, to blow-by gases (that generate NOx, SOx, particles), to fuel dilution, to residual wear elements, and to the degradation of its own additives.

Related questions:

• Can I simply refill the lubricant tank or do I have to change the lubricant?
• Can I refill the oil to avoid changing it?
• Why should I do the oil leveling in the sump?