WOW!
AOS defective seals will cause oil to be sucked into the Throttle Body. Clean out the Throttle Body and the ICV/ISV with Gumout Throttle Body and Fuel Injection cleaner. NOT Gumout Carburator Cleaner.
You could rebuild the Throttle Body WYAIT with the kit from Bruce Arnn
Home
Yes the lower crank seal, "O" ring need to be replaced. If the oil pump drive gear has a seal groove---------------replace.
You'll be done in no time
GL
John