No5 Jungle Carbine

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Originally Posted by Seaspriter

(I'm definitely not sure, but this may be the predecessor of the mysterious XG 297 grease). This beeswax/mineral jelly combination repels both water and oil while preserving the wood.

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XG-297 is mysterious as there is no record that this code was ever used.
XG-279 however has been mentioned before but there's nothing mysterious about it, it's plain regular automotive grease.
The relevant Defence Standard defines it as:
General purpose lubricant for automotive and artillery applications,
operated over the temperature range of minus 54°C to plus 105°C.

It is based on mineral oil with a metallic soap thickener. XG-279 is a UK designation, the Nato equivalent code for it is G-403.

Quote:

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Originally Posted by RossM10

operated over the temperature range of minus 54°C to plus 105°C.

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Thanks for the correction, clarification and translation into Nato Code. This operating temperature range runs from severe arctic conditions (Like Alaska, North West Territories, Finland) to above boiling.