Ben,
First thing you must do----

Have a bank account deligated to Vanagon parts only.

Buy the Bentley manual, or the Haynes.

I use Castrol GTX  20 / 50 oil, ( 15 /40 in the winter)  change every
3000 miles, and add Marvel Mystery oil to it to keep things clean,
inside the sewing machine.

For sure use a VW factory oil filter.

And for the coolant I use the Sierra phosphate free anti freeze.

May the VW God's be with you.

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Terry 85 GL