I understand what you mean by the bubbles does not lubricate... but if the bubbles are compressed and the oil pressure stays stable does'nt this mean that there is proper oil in the system?
Sorry to ask all the stupid questions, but I'm at a dead end here.
I've tried using a thinner oil, checked for vacuum leaks....
This weekend I will try to install a 3/4" hose for the return as well and discard the 2nd oil cooler and 2nd fiter for experimental purposes to try eliminate the aeration.
If the aeration dissapears I think I will install a 2nd oil cooler on the pressure line from the pump to the engine...
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Beetle Circuit Racer #71 2176cc Turbo
Beetle Circuit Racer #170 1914cc
Beetle Project T4 2666cc Twin turbo Methanol
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