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Sounds like you used what we yanks would know as BLO (Boiled Linseed Oil).

Used for a finish on rifle stocks for a few centuries or more here.

Here is an excerpt from the CMP on its us by the US Armed Forces.

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From the Trapdoor Springfield 45/70 era through the end of the M-14 era, the essential nature of manufacturer applied wood finishes included linseed oil, tung oil, boiled linseed oil, and what might be called boiled tung oil. While used by the Armed Forces of the United States, the rifles were usually cleaned and protected by the soldiers, sailors, and Marines using boiled linseed oil.
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If if it kept M1's from rotting away in the jungles of WWII it can't be all bad.