Contaminated Engine Oil

Contaminated engine oil that has picked up coolant or fuel is a common workshop problem, and the short answer is that it can indeed be recycled, provided the right technology is used. Simple filtration fails because the contaminants actively interfere with processing, so a sequenced recovery approach is needed to reclaim the valuable base oil inside.

Why Mixed Streams Defeat Standard Recycling

Water and glycol cause foaming and flash boiling as they heat, and glycol degrades into organic acids that corrode equipment and spoil the product. Light fuels such as gasoline and diesel evaporate early at low temperatures, creating fire and flash-point hazards, and if the vapours are not segregated they distort the quality of the recovered oil. This is why conventional recyclers often reject heavily contaminated loads or charge a premium for them.

The Recovery Sequence

Processing begins with pretreatment, where settling separates free water, heavy solids and metal shavings before the oil reaches sensitive equipment. Vacuum distillation then does the core work, lowering the boiling point so light fuel contaminants vaporise first and are captured separately, while the base oil distills off at temperatures low enough to avoid cracking and coking. Water, glycol and sludge remain behind as residue.

Recovering Value Instead of Paying to Dispose

A final polishing step removes residual colour and odour, yielding a clear, stable base oil that can be reused as lubricant, hydraulic oil or fuel. For facilities that generate such mixed streams regularly, on-site recovery eliminates hauling fees, reduces stored hazardous waste and returns a marketable product to the operation.

Learn More:

• Feasibility Studies for Waste-to-Value Projects
• Turn-Key EPC Delivery
• Plant Design & Engineering
• Facility Efficiency Upgrades
• Resource Recovery Projects

Reclaim the base oil locked in your mixed waste stream

Handle coolant and fuel contamination safely and turn a cost centre into product.

Klean Industries engineers recovery systems built for difficult, mixed waste oil feeds.

Considering a contaminated engine oil project?

Contact Klean Industries about contaminated engine oil » GO.