Mobil Jet™ Oil II was the first standard Type II oil on the market. With more than five decades of flight experience, it has accrued over 5 billion hours of on-wing performance. This legendary, hassle-free, second-generation oil helps keep engines clean and operating at peak efficiency. Laboratory tests and engine inspections confirm it can handle extreme speeds, temperatures (up to 204 degrees Celsius/400 F) and stresses without breaking down.