My '89 300E recently hit 240K kilometres and is going strong. I drive it daily (city driving) but make up for it by highway driving each weekend (approx. 300 KM). The car is going as strong as ever and still brings a smile to my face each time I cruise along at speeds over 150 kph.
Only major repair I had to do in the past year was the water pump. The pump didn't actually fail, but it began to leak. The part was not expensive ($200 CDN) but the labor was expensive. Total cost about $750 CDN.
I don\t have much advice to offer other than what has been said already about maintenance (especially oil changes! Larry is right on there), but as far as a dependable car goes, it would be hard to top a 300E!
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon