Clean oil is everything
to IVT/EVT solenoids, and so is proper viscosity. I can't tell you how many oil-burner engines I've seen tossing IVT codes because the owner added STP or 30W50 in order to limit oil loss. I also can't tell you how many trashed timing covers I've seen removed because the tiny oil passages feeding the phasers got sludged and a new IVT couldn't fix it.
The solenoids are pretty powerful and I've never seen clean, proper-viscosity oil of any type cause an issue, natural or synthetic. So use what you like, but it's the old story -- do the maintenance and don't f around.