Besides just getting a test on the Porsche oil, I wanted to compare the new BMW formulation (blended by Castrol/BP), with the old BMW blend by Spectro and the Castrol 4T conventional oil (to see if all the BMW oil is now is just re-badged Castrol 4T - a theory I was pretty certain was going to prove true). Here are the old results Kurt got for BMW and Castrol a few years ago for the BMWMOA (approximates based of his charts).
BMW Conventional 20w50 (Spectro Blend)
Viscosity at 100C: 18
Castrol 4T Conventional 20w50
Zinc: 950 ppm
Viscosity at 100C: 20
Here's the new results. NOTE: Although TBN was requested for the testing, I can only find the TAN on my test results, so for now that will be omitted...
New BMW Conventional 20w50 (Castrol Blend)
Viscosity at 100C: 18 .7
Porsche Classic Motoroil 20w50
Viscosity at 100C: 19.1
Based on these results, it appears that BMW does indeed have a different formula than Castrol 4T, which I was pretty surprised about. It also appears that the Porsche is lacking in the ZDDP area - so maybe the Germans really do believe Americans are the only ones concerned with ZDDP. The one thing Porsche had going for it was the Calcium level - 2026ppm compared with 636ppm in the BMW oil. BMW oil was also full of Magnesium and Porsche had almost none. That being said, I will not be using the Porsche in my airhead.
Attached are the full analysis results for the new BMW oil: