Mobil jet oil ii is recommended for aircraft gas turbine engines of the turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter) types in commercial and military service. it is also recommended for aircraft-type gas turbine engines used in industrial or marine applications. mobil jet oil ii is approved against the standard performance (std) classification of u.s. military specification mil-prf-23699. it is also compatible with other synthetic gas turbine lubricants meeting mil-prf-23699. mobil jet oil ii is compatible with all metals used in gas turbine construction, as well as with f rubber (viton
a), h rubber (buna n), and silicone seal materials.