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Yes. On most smaller turbos or just iron ring type sealing rings, anything much over 30psi can pass through. Also depending on the type of oil, it's densities at low and high temperatures effects the spool up speed. It's a fine balance to get the right flow of oil to reduce drag rate or reduce parasitic loss on the shaft while maintaining the lubrication qualities necessary to avoid catastrophic failure. That's why I machined my own bearings with the orifice size I wanted for the type of oil I like to run and at a given flow rate. Using an adjustable means to control pressure and flow rate allow for those operational characteristics. In the next video I'll be posting, you can hear how freely the impellers rotate and for how long upon shut off from idle. I use a different Bronze material than what is typically used for bushing type turbos.
As of recent, it has done well for over 10K miles!
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