synolimit,
I realize that you are referring to the anti-drain back valve located in the oil filter. That serves multiple purposes and may help out with drain back from the core some. However, the thermostatic sandwich plate itself is never closed when cold (unless you purchase the non-thermostatic unit). Since it is not closed, it will by-pass the filter altogether and can still drain the core back into the oil pan.
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Whtfairladyz formerly Dustin@Z1 
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