Anti - Cavitation tank oil draining rationale

[James D]

I have not viewed the anti cavitation tank system so please be easy with me, my query relates to the oil change procedure whereby the apollo tank is drained in conjunction with the sump.  With this in mind if when the car is not running the apollo tank returns oil back into the sump, why would you then drain an assumed empty apollo tank too?

 

Kind regards,

 

James

[SM25T]

Unless there is a one way valve in the small top breather hose .... then the tank wouldn't drain down .... unless you disconnect the hose at the tank top and leave it overnight. Can use thin hose from Pela vacuum pump to empty remains from tank.

[James D]

OK thank you, I have a braided SS line from the head of the engine to the top of the apollo tank with no sign of a valve.  I had assumed as the oil level goes up when the engine is off, that the apollo tank returned the oil back into the sump due to forces of gravity, be it rightly or wrongly on my assumptions.  

 

 

[Steveh7]

mine has about half a litre left in the apollo. I think the bottom hoses are  a fair bit higher then the bottom of the tank so they only drain oil down to the bottom of the lower hose leaving about 0.5-1ltr of oil?