Aside from just oil, most of the mechanics in that era required steam to help objects move. Steam is generated from a high temperature of water, or in other cases acts as condensation in colder environments. Steam is water vapour which in time would lead to rusting and the wearing away of parts or surfaces of metals and mechanical structures. So along side the smoke that blackens the construct, the power of steam and rust development enhances that 'aged' look.
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