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Date registered: May 2006
Vehicle: 2001 E320 - Brilliant Silver/Ash: 107,000+
Location: West Virginia, USA
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Quoted: 5 Post(s)
I would use what was originally in your car, but this can be difficult to determine for certain 1998 models.
For my former 98 E430, I was told it had been imported with synthetic motor oil, but that was because it was a later one. Earlier ones had regular oil in them. This is according to a certain dealer's service manager, I have never verified this using another source.
As you stated, this is a timeless question. I have 2 older cars that I have chosen to use conventional oil because of the above reason. However, I do think synthetic oil has been proven to be a better choice, for several reasons.
Mercedes Benz - Das beste oder nichts!