I was doing a little reading on mobil1 vs mobil1 EP. What made you decide to go with EP? (Im on the regular mobil1 now, but i'd consider EP if its beneficial)
Mobil-1 EP (Extended Protection) is a "true" synthetic with Group IV/V base stocks, and is acceptable for use with extended drain intervals (10k-15kmi, approximately). If using a Mobil product for the LR4 V8, the EP would be highly preferred. This isn't the place to save a couple bucks using the non-EP. The EP should be fine for the LR4 if changed by 10kmi (IMO).
Standard Mobil-1 (non-EP) is what I consider a "fake" synthetic, with Group III base stocks, that is just a highly refined dino oil. These type of oils have similar characteristics compared to true Group IV/V synthetics, with the primary exception being they do not tolerate extended drain intervals very well. After about 5k-7kmi these oils shear down and the engine will start to "burn" oil at a fairly substantial rate (like, a quart every 1-2kmi). The "burning" problem vanishes when the oil is changed, until it again reaches the 5-7k point. The vast majority of so-called "synthetic" oils on the market in USA are Group III, and they are fine if you change your oil by ±5kmi or so. I personally would not use a Group III oil in the direct-injected AJ133 LR4 V8 engine, even if changed at 5kmi, but that's just me.
How do you tell the base stock of an oil? It's not easy, a lot of research may be required to find out. As a rough guide,
most oils around $6-$8 per quart (retail price) will be Group III, while most oils $10-$12/qt (or more) are almost always Group IV/V.
To learn more than you ever wanted to know about oils, and read lengthy entertaining arguments, visit the BITOG forum:
https://bobistheoilguy.com/
For Mobil-1 oils specifically, read my old post #177 at this thread:
http://www.landroverworld.org/threads/diy-oil-change-for-lr4.22797/page-18#post-175734
As of this writing, the Mobil-1
product finder in USA still does not officially recommend any Mobil oils for either the 5.0L V8 or 3.0L V6 used in the LR4 in USA.