As long as it or the jerry had no water in it when it went in and it hasnt been opened in that time then it should be fine for a few years.
Just give it a good shake up to make shure that it is all mixed up as there are dewatering agents and surfactants etc that may drop to the bottom but not really likely unless it has been hot or gell build up if it's been excessively cold.
I have used 2 yo diesel from a 205ltr drum with no ill effects.


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