Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1059 Post(s)
What year and what model?
US models till 1999 had no timer on FSS, so you could drive on the same oil for years.
After 2000 they made 1 year for US and 2 years for the rest of the World (not sure what Canadians got).
How the computer determinate intervals is a secret. MB representative like to give a story about oil quality sensor, but nobody have ever seen one.
I think it is a program, that depends on engine load and oil addition adjust the initial 10,000 miles. Funny part I was towing heavy with my ML320 and still average 13,000 miles intervals on DINO oils.