Castrol VPI Concentrate OS is formulated specially for use in enclosed systems.


Diluted – Product may be mixed with system oil at a dosage rate of 2% or 20 grams per litre of system oil. Unit should be run for approximately 5 minutes to circulate product thoroughly.

Concentrated – Product may be added to a drain sump or crankcase at a dosage rate of 1.5% of system lube oil capacity. For optimum performance product can be sprayed via access hole into crankcase or void space. Care should be taken not to lose vapour to atmosphere during this process.

Technical Data

Name Method Units VPI Concentrate OS
Appearance Visual Light amber liquid
Relative Density at 20°C ASTM D4052 g/ml 0.93 – 0.95
Acid Number   mgKOH/g 18 – 22
Flash Point, PMCC DIN EN ISO 2592 °C 107
Viscosity at 40°C IP 71 mm²/s 64
pH Aqueous Dispersion     6.0 – 6.5
Ash Content     0

The above figures are typical of those obtained with normal production tolerance and do not constitute a specification.

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