Assessment of Used Motor Oil (Umo) Disposal Practices by Local Automobile Repair Garage Mechanics: A Case of Ilala Municipality, Dar Es Salaam, Tanzania

Abstract

The improper disposal of used motor oil (UMO) is a growing environmental concern, particularly in rapidly urbanizing areas with expanding automotive sectors. In many developing cities, local automobile repair garages significantly contribute to this issue due to poor waste management practices and limited regulatory oversight. This study assessed the knowledge and practices regarding UMO collection, storage, and disposal among mechanics in automobile repair garages within Ilala Municipality, Dar es Salaam, Tanzania. Data were gathered through structured questionnaires, interviews, and observations from 20 garages, involving 100 automobile mechanics. The results revealed that 80% of respondents sold used oil to customers for reuse, while 5% disposed of it directly into the ground. Regarding storage, 61% used plastic or metal drums, 16% used plastic containers, and 15% utilized any available containers, with 82% reporting no issues with storage. Awareness of environmental risks was relatively high, as 87% of mechanics were aware of the pollution caused by UMO, and 99% acknowledged the prevalence of careless disposal at garage sites. Weekly UMO generation was recorded at 1,628.5 liters from servicing 418 cars. Despite some government efforts, such as training programs and support for recycling practices, challenges persist, including poor record-keeping and the location of 84% of garages in residential areas. The study recommends enhanced training for garage workers and local communities and greater investment in sustainable waste management systems to align with the Sustainable Development Goals (SDGs) by 2030.

Key Words: Used Motor Oil (UMO), Disposal Practices, Garage Mechanics, Automobile Repairs

DOI: 10.7176/JEES/15-3-09

Publication date: July 30th 2025