It will last about 25,000 miles or two years, and then you will need another one. Save your pennies and get the proper one next time. New Benz OEM will last 15 years unless you are in the upper part of the rust belt.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!