Low Smoke + blend oil is a mix of mineral and synthetic oils. An oil that gives off very little smoke, a very important detail when used in products often managed in densely built up areas, and has extremely positive lubrication qualities for elements typically subjected to high loads in a 2t engine fed to mix it, such as the bearing of connecting rod. It also causes a lower engine temperature which extends the life of the engine. The formulation used in Husqvarna Low Smoke + gives excellent protection from seizure due to both lean carburetors and carbon deposits.