Castrol Aero 40 Red meets Douglas Aircraft Specification DPS 3.334 and is identified by Douglas stock number DPM 6176. Castrol Aero 40 Yellow serves as an approved alternative to Boeing Service Letters 707-SL-12-2, 727-SL-12-2, 737-SL-12-2, and 757-SL-27-15-B. These letters require an EP additive in either standard or corrosion-inhibited mineral-based hydraulic fluids for use in landing gear shock struts. Castrol Aero 40 Yellow fully complies with Boeing BMS 3-32 (Type II) standards.
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