I can't speak for the Toyota 2L engine pero sure ako ok din itong engine na ito since recommended nang mechanic mo.
anyway, as for the 4d56 engine, we all know "legendary" engine ito nang Mitsu, actually until now gamit pa rin ito nang Mitsu sa mga diesel vehicles nila like Adventure.
not much to say, pero ika nga nang iba, napakatagal na ring engine nang 4d56, subok nang matibay and madami ang nakakaalam kung paano i-maintain.