marine propulsion. changes in the condition of an engine¹s cylinders. technique pioneered by ExxonMobil. cylinder condition. Lubricants. maintenance and operating costs. . Signum Oil Analysis. before they occur, to include scrapedown testing. scrapedown oil. . Onboard testing. quickly analyze the current wear rate of each cylinder. engine's operating condition. . Quality oil. engine deposit and wear. rates are adopted. major engine manufacturers, including MAN B&W and Wärtsilä. onboard sample analysis is employed,² says Kjeld E. engineering services, MAN B&W Diesel A/S.