It's applicable to gasoline engines of more heavily-loaded truck which weighs less than 3.5 tons. It boosts torsion, reduces noises and abrasion. MOS2 can naturally build up protective film to fill the gaps between pores, slow down the oil deterioration and prolong engine's duration. It strengthens driving power, reduces waste air, saves oil fuel, avoids over-heat and noises. It's economical and smooth in running, forceful and long-lasting. Applicable to 4-stroke engines, gasoline (turbo) and diesel oil engine (pulley), LPG engine, engines of ships, agricultural and industrial engines etc. Apply 1 kettle for 4-5 L mobile oil. Idle for 5-10 minutes.