The USA produced 70% of the oil in the world in WW2. 20% of the oil was produced by the Soviet Union.
The British did not surrender and used its navy to blockade Germany’s oil imports. Germany imported 60% of its oil in 1939.
In 1941, Germany only had 18% of the oil it had in peacetime.
Germany had about two months of oil in June, 1941 which forced the attempt to capture Russian oil in the Caucasus.
Romania supplied Germany with roughly 13 million barrels of oil per year between 1941 and 1943. Germany’s peak oil production (in 1944) amounted to about 12 million barrels of oil per year. OIl from all sources, including synthetic (the majority) reached a peak of 71 million barrels per year. Germany peak oil requirements for normal operations amounted closer to 95 million barrels short by 20 – 25 million barrels.
The caucusus produced 220 million barrels of oil per year. Maikop produced 19 million barrels annually, Grozny 32 million barrels, and Baku 170 million barrels — Germany only needed to restore 10% of these field’s capacity to cover its needs.
Oil was decisive for air power
There were constant fuel shortages for Germany and shortages of aviation fuel. The US and Britain had higher octane fuel which enabled planes that were 15% faster.
There is a 31 page paper on oil in WW2.
Air Command and Staff college: Turning Point: A History of German Petroleum in WW2 and its lesson for the role of oil in modern air warfare. Shawn P. Keller, Major, USAF AY11 Spring Independent Elective Advisor: Dr. Michael May
The Luftwaffe itself carried out blending of aviation gasoline, and of particular interest to them was the high-grade oil that could only be produced through the hydrogenation method rather than F-T. By January 1941, Germany had stocks of aviation fuel totaling 219.5 million gallons, of which ninety-percent was a product of the synthetic fuel industry.
By the end of 1941 aviation fuel reserves were down to 91 million gallons. Although synthetic production increased substantially in 1943 into early 1944 and boosted aviation fuel reserves, quantities never come close to the January 1941 figures. German supply would not be able to keep up with Luftwaffe demand for the rest of the war.
By most standards, Germany’s synthetic fuel was a technological wonder, and equal in quality and performance to fuel refined from oil. This was particularly true of German diesel and motor gas. Development of high-performance aviation fuel proved to be the one exception. By the 1930s, standard aviation gasoline had an octane rating of 75-80.
A breakthrough in gasoline technology occurred in the United States in 1935 that made it technically possible to produce aviation gas of up to 100 octane. By 1939, both the U.S. Army Air Corps and the RAF were using this higher-octane gasoline, allowing them to develop more powerful engines such as the Rolls Royce Merlin. The net result was that U.S. and British aircraft were now able to fly 15 percent faster, increased their long-range bomber distance by 1,500 miles, and lifted altitude ceilings by 10,000 feet.
Late in the war when German engineers were working feverishly to develop aircraft engines that could compete with the newer and faster Allied fighters. Unfortunately for Germany, Allied assaults against the synthetic fuel plants had already made production of higher-octane fuel virtually impossible. Germany never obtained aviation fuel equal in quality to the Allied air forces, and Luftwaffe aircraft development suffered greatly for it.
India and China today are more dependent upon oil
China imports 70% of its oil and India imports 87% of its oil. They mostly get the oil from the middle east which could easily be blocked with a naval blockade. The US has the stronger Navy and could apply such a blockade against China.
India produces 750,000 barrels of oil per day.
India imports 5 million barrels of oil per day.
China imports most of its oil from the middle east. If there was a conflict where China face a naval blockade then China would be cut off from most oil just as Germany was in WW2.
India also mostly imports oil from the middle east.
Unlike WW2, China can use long-range missiles to hit Saudi Arabia and US oil refineries and infrastructure to force oil shortages for everyone. They could also hit GPS satellites to reduce the effectiveness of US precision warfare.
China economy is more vulnerable to disruption.