Estonia has had an industry for processing oil from shale since the early 20th century so in some cases, the infrastructure and personnel may still exist. Or reconnaissance may have confirmed that the infrastructure was in a damaged although repairable state.
Also, the process for recovering oil from shale isn't particularly difficult and the basics of the process having been known in Europe since at least the 1600s. You can find information on it in any good encyclopedia.
The 8th ID heading for the shale deposits in Estonia certainly makes for an interesting speculation because the oils extracted don't necessarily have to be used for fuel.
Lubricants are far more important. Alcohol can be used for fuel but you can't use it to 'lube up' the bearings on an axle.
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