Engine Oil Change Frequency

Re: 2008 ML350 (90,000 Miles), & 2006 ML500 (125,000 Miles)-
Is there any merit in changing oil/filter before due date for Service A. Service A automatically resets to 20,000 Km (about 12,500 miles) after each oil change. But because of the old age of the engines I thought maybe I should change it earlier.
Any guidance will be appreciated.

Just by chance, are you familiar with WSS codes. I have a problem with front passenger seat.




Re: 2008 ML350 (90,000 Miles), & 2006 ML500 (125,000 Miles)-
Is there any merit in changing oil/filter before due date for Service A. Service A automatically resets to 20,000 Km (about 12,500 miles) after each oil change. But because of the old age of the engines I thought maybe I should change it earlier.
Any guidance will be appreciated.
Youll find all sorts of views and emotions on this topic.What I know is that the service intervals noted by car manufacturers are designed to minimise service costs in the first three years of ownership to get the new car buyers back for the next model based on low service costs. So they stretch them out to ridiculous levels. Noting that oil loses ots viscosity with miles, the more often you change it the better. But that won't save a stuffed engine.
Good quality MB Spec No. oil, a new quality oil filter every 5-7k miles and there's not much more you can do.
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