An approved Lycoming engine oil additive for prevention of oxidation of all metals.

Designed for use in engine oil at 1:10 concentration, VpCI™ (Vapor Phase Corrosion Inhibitors) will protect your engine from corrosion (in solution and in all void spaces) for up to 3 years during storage.

This corrosion inhibitor oil additive for hydraulic oil and gearbox assemblies, performs effectively under the adverse conditions of 100% relative humidity, and in the presence of such corrosive species as chlorides, sulfur compounds or hydrogen sulfide. Contains no hazardous chromates, nitrites or phosphate inhibitors and utilizes the finest paraffinic petroleum distillates as carriers.

VpCI-326™ possesses an exceedingly high flash point, enhancing in-plant safety when compared to common oil protectants and is supplied in concentrate form, which is easily diluted with lubricating, hydraulic or preservative oils, saving shipping and inventory expense.

A broad range corrosion inhibitor is not only effective on ferrous metals, but also effective on zinc, aluminum, galvanized steel, copper, cadmium, silver, brass and many other alloys.


  • VpCI™-326 provides universal corrosion protection to ferrous and non-ferrous metals
  • VpCI™-326 is nitrite-free, non-toxic and thermally stable, providing long-lasting contact and vapor phase corrosion protection
  • With VpCI™-326, most lubricants can be upgraded in their anti-corrosion ability providing continuous corrosion protection during operation, standby and shutdown periods
  • Passes through 1 micron filter
  • Conforms to MIL-PRF-46002C
  • Conforms to MIL-I-85062 (Additives to oils)
  • Conforms to MIL PRF-16173E
  • NATO 6850-66-132-6100
  • NSN 6850-01-470-3358
  • Appearance: Clear to slightly hazy yellowliquid
  • Corrosion Resistance: Up to 24 months
  • Coverage: 960-1456 ft2/gal (24-36 m2/l)
  • Film Type: Oily, paraffinic
  • Film Thickness: 0.5-1 mil (12.5-25 microns)
  • Flash Point: >230ºF (>110ºC)
  • Non-volatile Content: 83-93%
  • pH: 8.7-10.0 (1% solution)
  • Removal Method: Petro-solvents/alkaline cleaners (VpCI-414/416/419)
  • Density: 7.2-7.4 lb/gal(0.86-0.89 kg/l)
  • Shelf life: 2 years
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