Return it to WP. Their 20L jugs of Motul 8100 Xcess 5W40 is a much better product for the same price.
Good pick up on the supplier! I have no doubt that the 8100 X-cess 5W40 is a superior product. I've used it myself in my Audi A4(have since switched back to Castrol Edge 0W40). However, buying motor oil in bulk(even only a 20 liter jug) isn't really practical for me. Like I said, this is basically for a low mileage, annual OCI on a vehicle which has a tachometer that never really gets a 'good workout'. I just thought the semi-syn Motul made sense in this application.