In 1959, Perkins Engines from Peterborough, England was purchased. Perkins have been the main Diesel engine supplier for Massey Ferguson for many years. In 1990, Massey Ferguson took over Dorman Diesels of Stafford and merged it with Perkins to form Perkins Engines (Stafford) Ltd. In the 1980s, Perkins purchased Rolls Royce (Diesels) Ltd, to form Perkins Engines (Shrewsbury) Ltd. In 1998, Perkins was sold off by then-owner LucasVarity to Caterpillar Inc., who were a major customer for their smaller and mid-sized engines; Caterpillar was a major producer of large Diesel engines for stationary and mobile application.