Not washing it is really not a good idea. Take the extra time and steps to make the stuff right. You want the fuel as clean as possible to get out the stuff your IP does not need to deal with.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair