ditto o-rings. I just did this job on my 606 this weekend. Did the diesel purge, oil/filter change, air filter change and totally forgot about the o-rings on the shutoff valve. Only occurred to me when it got stinky. Good now.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900