Is it necessary to change your oil directly if you ran Seafoam thru the brake booster vacuum line.

 

Putting seafoam into the brake booster is going to introduce it into the combustion chamber which obviously will not come into contact with oil. If you're talking about seafoaming the oil, which is normally half the use(the other half going into the fuel tank), then yeah you'll want to idle it for a few minutes and then draining it out immediately after.