If by chance I for instance have say "Mobil 1 5W-30" on my shelf, am doing a oil change on a vehicle that says it requires "Ford WSS-M2C945-A" and Mobil does not have that specification listed on the back, but is ILSAC GF-5, ACEA A1/B1, A5/B5, API SN, SM, SL. ... Login to read more.