Germany as we know turned its attention to Russia after the fall of France and the BOB.
The scenario I am suggesting is that instead of turning to Russia after the BOB, Germany concentrated on the Middle East and captured the area with its vital oil resources.
As a result Germany can attack Russia in 1942 with secure oil supplies at a time of its choosing weather wise. Germanys main tanks PzIV and PzIII will have been equiped with the 75L43 and 50L60 respectively and the PzII converted to Marder SP AT tanks. In addition the German airforce would have been able to plan for the more strategic role that would be of assistance in Russia, plus the German airforce would have had time to increase its size and change its balance thinking of additional transport aircraft.
Granted Russia would have more T34 and KV1 tanks but the PzIV would be able to handle them but the Russian airforce would still be heavily outclassed in quality.
The question is, would Russia survive?