Castrol and Palm Beach Gardens, Florida-based machine tooling company Gehringagreed to explore ways to increase the efficiency of combustion and engine lubrication. Cincinnati, Ohio-based Pilot Chemical announced Mike Clark will assume the role of president of the company while continuing to serve as its chief operating officer.Hydrodec – which operates a transformer oil rerefinery in Canton, Ohio – announced that its CEO David Dinwoodie succeeded Michael Pitcher as president of Hydrodec of North America.