UCO follows FSSAI RUCO. Used engine oil follows hazardous-waste and CPCB EPR rules. Never mix them. How BioTradX lists both.
Kitchen oil
TPC 25 percent, 50 litres/day records, authorised RUCO aggregator, biodiesel plants. Search: sell used cooking oil, RUCO, UCO collection.
Engine oil
Authorised recycler, no food-chain story, re-refining or authorised recovery. Search: sell used engine oil, CPCB recycler. Dealer example: Globe Toyota x BioTradX, see I Am Renew and ET Auto.
The mixing failure
One drum with both is unsellable to serious buyers and can contaminate a tanker. Hotels with a basement workshop make this mistake.
List correctly
Two listings. Two buyer pools. Two document packs.