What are the differences between dry type and oil filled transformers in relation to transformer oil?

The differences between dry type and oil filled transformers in relation to transformer oil primarily involve insulation and cooling methods. Oil filled transformers utilize transformer oil for both insulation and cooling, enhancing heat dissipation and providing electrical insulation. In contrast, dry type transformers do not use transformer oil; they rely on air or solid insulation materials, which limits their cooling efficiency and makes them suitable for lower voltage applications in environments where flammable liquids are a concern.