So, if the Axis somehow managed to discover, harvest, and capitalize these resources before 1937 or 1939 at least, would it have massive changes to the war? I assume that Japan could probably delay an invasion of the DEI, as not only rubber, but also oil is found in Manchuria.
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EDIT: With respect to your edit about the Daqing oil field, it would take two PODs for that:
1. The belief for oil exploration at the time was that oil deposits were located either in shallow seas or in areas that had once been shallow seas. With OTL knowledge, the Japanese wouldn't have looked there.
2. Seeing the need and having the money to explore and drill the oil field as well as build the supporting infrastructure (pipelines, tankers, refineries).
Problem is neither the technology nor even the idea to look in some of these locations existed in 1938; I am quoting a post from another thread which discussed the early discovery of the Manchurian Daqing oil field:
Wasn't there oil in Northern Sakhalin? Perhaps somehow they can get their hands on it.. Somehow.
Also, Romania was a good ally for germany for oil.
Not sure where they would get rubber and such though, since the Axis had no colonies except Ethiopia. Don't think there was rubber to be found in Ethiopia.