[diesel_mercedes] Passing Inspection/Emissions test

 

I have a 1991 300D due for its bi-annual emisssions test.  I usually use MMO with diesel fuel and add Diesel Kleen or SeaFoam occasionally.  I can get B20 at a truck stop once in a while, in which case I don't use any additive.  It doesn't appear to be a "smoker".  When I'm under heavy acceleration I think I see a little fog in the rear mirror, but hard to tell.  It does have 288K miles on it.

 

QUESTION:  When I bring it in for the emissions test, what is the best thing to have in the tank?  Straight Diesel, B20 or diesel and an additive?

 

I'm in RI, which I think is not as strict as CA.

 

Any advice?

 

Joe

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