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Royco 581 Corrosion Preventative Compound 55USG Drum *MIL-C-6529C Type I

Silmid P/N: ASF2XN55US
£4481.96 (excl VAT) £5378.35 (Inc VAT)
No stock - lead time 87 days
Please order in multiples of 4
Bulk discounts
£4481.96 + VAT
£4257.86 + VAT
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£4033.76 + VAT

ROYCO 581 is a concentrated rust and corrosion preventative oil commonly used to preserve aircraft reciprocating and turbine engines.

Technical Information

  • Commodity Code 27101999
  • Country of Origin United States

Product Properties

Pack Size
55USG Drum
Product Colour
Manufacturer Name


Joint Services Designation

Please Note: Specifications and approvals are subject to change at any time. Users should always consult their AMM or the OEM when selecting products to ensure items have the release needed. Only specifications listed on the order confirmation will be certified on the Silmid CofC.

Product Information

The ash less anti corrosion additive package and the highly refined petroleum base oils protect the engine by minimising the effects of humidity and neutralising the acidic components of engine oil oxidation and combustion by-products. ROYCO 581 is normally used as a concentrated engine oil additive for the internal preservation of engines or engine parts and accessories during moderate outdoor to long term indoor storage periods.

Diluted with three parts engine oil (to MIL-L-6082 for piston engines - which has been superseded by SAE J1966 - or to MIL-PRF-6081 for turbine engines) the engine is then preserved for storage. This product can also be used as a fly-away oil for reciprocating engines however operation of engines preserved with the diluted material should be limited to a maximum of fifty hours before oil change. This additive has also been used successfully in the preservation of industrial gasoline and diesel fuelled engines as well as preservation of industrial gearboxes and machine tools.

Please Note:

Turbine engines using synthetic engine lubricating oils should use a MIL-C-8188 corrosion preventative concentrate.

Shipping information

Orders over £100 placed online will now qualify for FREE UK Mainland delivery*

Orders under £100 placed online for UK Mainland delivery is £12.00*

**Orders requiring Pre 10.00am Next Day delivery has also been lowered from £35.00 to £30.00, orders placed through the office will incur additional charges.** 

International delivery (door to door delivery) is available for selected countries worldwide. Shipping will be automatically calculated based on the weight, location and hazardous nature of the goods. Customers can also choose ex works to arrange their own collection.

Please refer to our delivery page for more information.