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Hi Lee,
Thank you for the insight into the Hisso problem and resolution. This certainly supports my thoughts and makes sense. I am guessing the relief was needed for cold starts more than for high altitiude effects. Was that the case with the Hisso?
One other little fact on the Mercedes oil system; there is a "pressure regulator" on the oil pump. This "regulator" is simply a small piston with a coil spring under it. When the oil comes out of the pump it goes into a chamber above the "regulator" piston, and since the oil is coming in surges from the oil pump, the spring loaded regulator will "dampen" these surges and make the pressure more constant to the system. If the oil became to thick or the pressure too great, the regulator would become ineffective and "bury itself", and than cause damage to the bearings.
Gotta run,
Dave
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