I don't think it is the make of the car. May it be Honda,Toyota,BMW etc etc since they all have similar designs and run at almost same specs.
Blame it on the mekaniko. When you want to get it done, do it yourself. Don't trust any Filipino mekaniko on the streets or elsewhere as there is no real education here for automotive.
*Get a Helms manual from e-bay or download it somewhere.
*Get only genuine parts from Japan or states as the cost is not much different even cheaper sometimes (if you are using a JDM engine).
I have many horrors having my cars fixed before. In the end it costs me more on labor than doing it myself and getting my parts elsewhere.
You can get it fixed by a mekaniko but then again you risk stuff like that.

To your problem:

There is a great possibility that the oil seal was installed baliktad or not sitting correctly. Yes sometimes the leak will only show up after a few months. I was stupid with my rack and pinion assembly before. I installed the seal facing the wrong direction and it only began leaking after 1 year of driving. After I disassembled it again the seal was completely in tact (No damage of wear out). When replacing this you must make sure you TORQUE your pulley nut to specs as you do not want it flying out while you drive your car.