Official Answer
Answer
Oil-dipping provides only temporary 'shelf-life' corrosion protection and is unsuitable for outdoor or humid environments. Zinc-Phosphate coating (per MIL-DTL-16232) provides a porous crystalline structure that holds oil more effectively, offering significantly better salt-spray resistance (often $72+$ hours). In automotive drivetrain applications, zinc-phosphate is preferred because it prevents rust during shipping and assembly while remaining compatible with transmission fluids. For even higher protection, mechanical zinc plating or organic coatings are used, though they increase the ring's thickness and may affect fitment in precision grooves.
