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I have a '98 E300 Turbo and had oil analyses done at each change with the last one being at 11.5K miles and still could have gone much further (see attached if you can read it). The FSS was saying 14K which is what the oil could easily have gone and still been fine.
Changing M1 at 4500 miles is a HUGE waste of money. Use the M1, go with the FSS and you will be fine.
Also, if you buy it at Wal-Mart you can get the gallon jugs for about $25 each so 2 gallons = less than $50 plus a filter. Certainly not $93.
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Marty D.
2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz
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