wemay
Site Donor 2023
Member, Tommygunn has posted an interesting thread (link below) where M1 has omitted or doesn't show compliance with certain ACEA requirements on their 5qt jugs sold at WMart. This is interesting because these same viscosity have shown the said approvals before.
My question/moment of clarity is this, if the receipt you have only says 'Mobil 1 5w30' /' motor oil 5w30' / '5w30' or 'M1 5w30' as has been the case with my receipts from WMart, it would be very difficult to deny a claim if you show the recommended viscosity has been used because oil companies change formulation, packaging, and certification vocabulary (meets, exceeds, approved etc) often.
http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3444271/Mobil_1_is_slipping,_ACEA_down#Post3444271