I have had seal fail and cross contamination.
EP90. The standard universal joint in the Series front end won't lubricate all that well with the one-shot grease. That was originally specified for the RRC which had open CV joints in the front swivels - a very different proposition to the old U-joint.
I've never run anything else in my IIA 109 and after over 100K miles the u-joints are still good as new (some mileage with free-wheeling hubs, much without).
ajr
I'm surprised my prop UJ's have lasted than long then. They are only greased with a gun periodically.