A friend recently bought a used '21 VW Passat with 1.4T from a Nissan dealer. Shop mngr said they put in their type 0-30 Full Syn, not Euro. His manual calls for ACEA C3/B4 0-30; Should he have it changed to something like Mobil-1-ESP-Full-Synthetic-Motor-Oil-0W-30, or use what is in it for...