Nissan has announced that a clean diesel engine will be offered on its Japan-market X-Trail SUV. Based on the M9R engine co-developed with Renault (it's marketed as the 2.0dCi in the French automaker's vehicles), the Nissan version will use new catalysts and engine management developed in-house. No specifications on Nissan's version of the engine have been made public yet, but in Renault guise it's good for over 40 US mpg in the combined cycle. Nissan also issued a separate release that focused specifically on its development of a SULEV-standard clean diesel (more on that at AutoblogGreen). It's pasted in full after the jump in addition to the brief release about the diesel X-Trail. Along with bolstering its diesel offerings in Japan, Nissan is paving the way for diesel powerplants in the US, as well, with a clean-diesel Maxima slated for 2010.