A method for predicting soot content in diesel engines includes generating a look-up table of the rates of soot introduction into the engine oil based on one or more engine operating conditions. When an adjustment knob is operated, a first cable can be loosened and pulled so that the first and second swing arms can move the brake devices away from and toward a flywheel, thereby adjusting magnitude of resistance to rotation of the flywheel. The collimating lens directs light to a reflex part to be tested, for example, one being manufactured by an injection molding machine to be used as an automotive lens. The ring gear of the first gearset can be connected by a third shifting element to the housing and by a fourth shifting element to the carrier of the first planetary gearset. The pipe joining material may include a thermoplastic material such as polyvinyl chloride andor chlorinated polyvinyl chloride and a bonding agent for the thermoplastic material. 65; a high index planarization layer made of an enamel having a refractive index comprised between 1.