I just had an A Service and noticed the RO had 5W-40 oil listed, a change from the old 0W-40 from past (both Mobil 1).
My dealer informed me that MB sent a bulletin to all dealers advising the use of Mobil 1 5W-40 now.
Anyone know or speculate about the reason for the change?
Car is a 2000 E320 (non 4-matic)