Limits of closer German-Japanese naval cooperation

How might closer and more regular German-Japanese cooperation have affected World War II?

Greater exchange could have moved Japanese 18-inch gun knowledge west and German synthetic-lubricant technology east, but neither partner could escape its financial limits.

Germany and Japan already cooperated, so the counterfactual requires a deeper exchange of designs and industrial knowledge. One possible transfer gives Germany access to Japanese 18-inch gun work. In the opposite direction, Japan could receive German synthetic-lubricant facilities, with synthetic fuel mentioned more tentatively. Each country would still face limits imposed by its available funding.