Substrate	Bacterial strain	Biodegradation rate (%)
SAE 40 used oil	Acinetobacter S2	15.46^bc ± 1.24
SAE 40 used oil	Pseudomonas S7	13.73^c ± 1.51
SAE 40 used oil + Tween 80	Acinetobacter S2	18.15^a ± 0.46
SAE 40 used oil + Tween 80	Pseudomonas S7	16.76^ab ± 0.55
SAE 40 used oil + SDS	Acinetobacter S2	16.86^ab ± 0.69
SAE 40 used oil + SDS	Pseudomonas S7	13.81^c ± 0.21