This thread may be helpful:
http://www.peachparts.com/shopforum/diesel-discussion/415813-propel-fuel-instead-my-regular-diesel-fuel.html
Post 13 addresses the OP’s question, both now and then, actually.

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Christopher
'06 Mercedes E350 station wagon (silver/black)
'85 Mercedes 300D (black pearl/palomino)
'85 Mercedes 300SD (smoke silver/burgundy)
'79 Cadillac Sedan DeVille

'05 Toyota Camry (because always running is nice)

'85 Mercedes 300D sold back to orig. owner 8-1-06
'84 Volvo 264GL Diesel, owned 2000-2013