The last time I saw the Porsche oil recommendation list, the liquid cooled engines the 5w-50 was not recommended or approved, but Mobil 1 0w-40, and Castrol Syntec 5w-40 were.
L&N Engineering makes a retrofit kit for IMS bearing. Depending on single or double row te price is a little different.
To do the RMS correctly you need to use the latest seal and replae the crankcase bolts with updated bolts.