From above:
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.....for passenger cars with gas and diesel engines with extended drain interval indicator FSS up to 20,000 km, or 40,000 km - 25,000 mi, min. 1.0% fuel saving compared to .....
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For a car that does 85% of its monthly mileage on the highway or about 2,500 a month ... how long can a synthetic be left in the crankcase?
Is a 10,000 mile interval OK? I am speaking of the 190e 2.3 specifically.
Haasman