The Sulfated ash test is meant to measure the purity of the lubricant. Pure basic oils contain no ash. In most cases, oils are very similar: same color, same texture, same odour. With additives however, their performances can be dramatically improved. Many of them promise to prolong your engines’ useful life and improve their operational effectiveness.

Have you ever heard about varnish? Not as famous as wear and corrosion, the two major failure problems of machines and lubricated systems, varnish is considered worse and may occur without knowing the cause.