Nothing's really changed except that MB determined that 13k mile oil change intervals would be more than sufficient to make it last 50k, which takes through the lease and out of warranty.

If it were me, I'd change the oil every 5k miles.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record