Engineered for use in commercial and business aircraft, Mobil HyJet IV-Aplus is the hydraulic fluid of choice for many of today's mixed-fleet airlines. Mobil HyJet IV-Aplus is a fire-resistant Type IV phosphate ester aviation hydraulic fluid that offers performance capabilities at levels close to those of Type V fluids. Mobil HyJet IV-Aplus hydraulic fluid offers outstanding rust and deposit control. The lowest density Type IV fluid commercially available today, Mobil HyJet IV-Aplus hydraulic fluid can help airlines save money.