Workshops, docks, and fleets in Mumbai can sell used engine oil through BioTradX collection with licensed recyclers.
Mumbai sources
Thane-Belapur industrial belt, Navi Mumbai logistics, island-city workshops, and large housing-society contracted garages.
Access constraints
Note if the drain point is in a basement. Many recyclers use small vehicles for first-mile, then bulk at a transfer point.
List for collection
Post used engine oil with pin code and weekly litres on BioTradX.
Do not mix with UCO
Kitchen oil and engine oil in one drum makes both lots unsellable to serious buyers.