where to find best motors for my monte..

good day...
may march hoping that decided na kami kukuha ng montero sports glx manual trans..
my worries is ung ibang dealers?motors daw nagkakaprobs after marelease na ang unit..
like ung plate ang tagal makuha..
ask ko lang what really out do there jobs after they got our money..
yo ko mag ka probs..
thanks