We know the Formula V guys ran oil coolers. Some had room to run them across the top of the engine. You won't. Blueberry(#77) had a fairly elaborate pressure plenum setup. Ed could comment on that stuff. Not too much oil volume in a VW but the point where more oil flow is actually necessary vs. just a good idea hasn't really been proven to me. Not that it isn't beneficial but at just what point is it necessary. There are buses with over 100,000 miles on them without the HVX mods. I'll likely do the HVX mods as it "can't hurt" as long as the pressure is bumped up. Increasing flow without extra volume could create some issues but I don't want an add on pan, sump, etc. I read somewhere that we should "port" oil return holes to the bottom of the engine to facilitate unrestricted oil return.