I just went through that last weekend - couldn't find it anywhere and 3 of my 4 diesels are due for changes. So I gave up and ordered some AmsOil heavy duty 15W40. Cheaper than the Mobil 1 (even after adding $20 to become a "preferred customer"), and it arrived the next business day.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References