I notice you're asking about and a Renault vehicle, but the phrasing is a bit unclear.
Regular maintenance using the correct tools not only makes the job faster but also preserves the life of your engine. Renault diesel engines are known to last between when serviced properly with the right equipment. Go to product viewer dialog for this item. mot 1654 renault best
If you're referring to the properties of the engine oil or lubricant recommended for use in a Renault MOT 1654 engine, then "solid content" might relate to the physical properties or specifications of the lubricant, such as its viscosity, density, or perhaps the presence of solid additives. I notice you're asking about and a Renault