Catalyzes the hydrolysis of acyl-CoAs into free fatty acids and coenzyme A (CoASH), regulating their respective intracellular levels (PubMed:25114170). Displays higher activity toward long chain acyl CoAs (C14-C20) (PubMed:25114170). The enzyme is involved in enhancing the hepatic fatty acid oxidation in mitochondria (PubMed:25114170). H2O + hexadecanoyl-CoA = CoA + H(+) + hexadecanoate H2O + tetradecanoyl-CoA = CoA + H(+) + tetradecanoate H2O + octadecanoyl-CoA = CoA + H(+) + octadecanoate eicosanoyl-CoA + H2O = CoA + eicosanoate + H(+) decanoyl-CoA + H2O = CoA + decanoate + H(+) dodecanoyl-CoA + H2O = CoA + dodecanoate + H(+) (9Z)-octadecenoyl-CoA + H2O = (9Z)-octadecenoate + CoA + H(+) (9Z)-hexadecenoyl-CoA + H2O = (9Z)-hexadecenoate + CoA + H(+) (9E)-octadecenoyl-CoA + H2O = (9E)-octadecenoate + CoA + H(+) (9Z,12Z)-octadecadienoyl-CoA + H2O = (9Z,12Z)-octadecadienoate + CoA + H(+) Lipid metabolism; fatty acid metabolism. Monomer. Highly expressed in brown and white adipose tissue, muscle, heart, kidney, lung, adrenal gland and spleen; weakly expressed in intestine, testis and brain. In the liver, by peroxisome proliferator (Clofibrate) treatment, via the peroxisome proliferator-activated receptors (PPARs) or fasting for 24 hours. Belongs to the C/M/P thioester hydrolase family.