Just dropped off my E300 for it's first oil change in about 5k miles (the 1st since I've owned it) at an indy around the corner from my office. Still getting a feel for how much I like them but my first few experiences have been pretty good. They fixed my power steering very quickly and cheaply when some power steering fluid lines popped off. After questioning them they said they use a standard 15w-40 oil for Mercedes of this age (1997). He said they use it for gas and diesel w210s. They seem very knowledgeable in speaking with them but this seems a bit contrary to what I've read here. I've seen plenty of 1995 and 1996-1999 E300s being serviced here so I assume they know what they are talking about but I'm just a little concerned. Also what is a good service interval for an oil change in a 97 E300 w/ 123k? I don't drive much but it is almost all city driving.

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'86 560SEL-108k,Sold Mar. 2000
'95 Landcruiser-113k,Totalled Aug. 2001
'92 Mazda Miata-22k,Sold Apr. 2004
'89 560SEL-31k,Sold Mar. 2005
'95 E300D-121k,Sold Dec. 2005(Mistake)
'95 BMW 740iL-26k($$ Pit),Sold May 2006
'06 Jetta TDI-8k,Sold May 2007(For MSRP!)
'97 E300D-123k,Sold Jan.2009