yes, you can add a little bit of xylene or acetone to diesel...or even biodiesel....to improve combustion and clean out the nozzles and chamber. with low sulfur diesel....there is less or no need to add this in any frequency.
however, if one chooses to add other chemical additives, only a small amount is needed. I add no more than 4 oz to the whole tank...so only 4 oz to 12 gallons.
you are your own warranty in doing so.