Can I use household oils instead of sword-specific products?
Updated Feb 2026
Mineral oil from a pharmacy works perfectly for blade protection and is chemically identical to many sword-specific oils at lower cost. Avoid cooking oils which can go rancid and attract dust. Avoid WD-40 which is a solvent, not a protectant. Choji oil is traditional and effective but mineral oil is a fully adequate substitute. The important thing is using any appropriate oil regularly rather than using the perfect oil inconsistently.