It seems like the only consensus is the use of synthetic oil vs. mineral. I also have a 78 Alfa Romeo Spider Veloce and have and continue to use mineral oil on the unwavering advise of many who own these cars...I know the 300CE is a totally different animal...but I have always believed in mineral oil and change religiously every 3000K miles...can someone give me a sound reason to change to a synthetic for the Benz?

Antonino