Maybe the Prestone is the long-life, low silicate formula?
I'm not sure where that product sits on the MB approved list.

Engatwork has a point.

Someone who services MBs for a living should be using the MB product or the Valvoline/Zerex counterpart that gets touted so much.

My 2 cents.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"