I think that alcohol has blurred your vision?
After 20 passes with 116 octane leaded gas, my oil is black and contaminated, and will be glad to send it if you will use it in that BBC, and I will also send the grey crud I remove from my oil filter housing as well. :biggrin:
Too bad you could NOT let his comment slide, as it points out your lack of knowledge and experience, except for what you do on one race car.
Leaded gasoline was probably gone from the pumps before you matured, or you would have seen what residue and crud it leaves in the engine oil pan, valve covers and elsewhere even on street cars. On forced induction cars there is much more compression gases pushed into the crankcase which greatly accelerates oil contamination.
Stick around and maybe you can learn something about race cars that burn leaded gasoline!