Minor note on terminology: you can't really "spam" four different units (mortars, scout cars, MGs, grens). That's just an army composition.
Your (AI) opponent has made a considerable investment into early game units, both in terms of manpower and fuel. On the strategy-level, I'd say play defensively (hold 50% of the map, or at least your fuel), build a fuel depot and pump out a T-70 ASAP. That will easily crush the entire opposing army, and you can follow up with T-34 against his T3 vehicles. Straight up Maxim spam should easily be able to hold him off if you use them defensively and to support each other. Maxims kill scout cars pretty fast.
Tactically, make sure to keep moving your MGs to prevent them from being bombarded. If I think a mortar is nearby, I immediately pick up and move the MG after suppressing an enemy squad, then redeploy.
edit: I'll add that I'd keep the # of Conscript squads low, somewhere between zero to two. Against that build you'll likely bleed manpower more and not do anything constructive.
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#Steam AliasWL%Streak
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