The Mistral is know as the "Terrano II". It was a follow up of the D21 (Eagle) based Terrano series (the one relased here). It is a truck unlike the X-trail which is a unibody.
Frontier = X-terra/Xciter/Paladin
X-trail = some car I don't know. hehehe.
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the x-trail uses QR series engines (2.0 and 2.5 gas) which could also be found in USDM sentras. JDM x-trails also has the 250 hp SR20VET as an engine option.
asian frontiers uses diesel engines, namely the aging TD27 and QD32. the frontier in thailand uses the ZD30 engine, the same one that can be found in our local nissan patrols. US frontiers use the KA24DE (in line 4) and the VG33DE (V6), both of which are nearing phase out.