Uploaded a photo on the Miata 3D Printing Association on facebook (If your not a member its worth checking out!) and had a lot of interest in this so i thought I'd spend some time in thinking about what's needed and designing a couple.
This is designed to speed up the flow of oil and also be a sturdy platform for a funnel to fit.
Thread size is 36x4mm so might fit other cars.
V3_fixed.stl | 643.7KB |