of all the frontiers this is the one i hv the least amount of experience wit but i'll try my best here
the YD25 frontier is not a bad pickup, smaller more economical engine, stock intercooler, fastest acceleration of all the frontiers, exactly the same as a fully-loaded ZD30 and once ur not venturing off-road it'll do the same job as a 4x4 in terms of load carrying capacity and durability
the Navara also carries a YD25 engine, altho it's a more modern version
nw the only fault that is YD25 specific that i heard of was the turbocharger giving trouble, and i personally knw one guy who had to change his turbo twice
but in this one case this guy drives relly hard, doesnt hv a turbo timer, doesnt let the turbo spool down after a hard run and the replacement turbo he installed was one he got frm his padna for $8,000 and turned out to be a cat-in-bag scenario
so i dont tink this is a very common problem, an it all comes down to the conditions under which ur truck used and maintained but u still shud be mindful of it just in case
one more thing, i called a guy a while aback lookin for a YD25 bonnet to throw up on my Frontier....the bonnet was already sold, but wat he did hv was a goldmine in my eyes
the Frontier he had was an Euro-spec YD25 4x4 that was to be scrapped down for parts
it wud hv been a direct bolt up to convert the 4x2 YD25 to 4x4, so if u decide u want a 4WD vehicle later on this can be a very real possibility
plz read this review on the Frontier shud be generally helpful
viewtopic.php?f=41&t=361687&hilit=frontier+solo&start=30