Kindly put all the prices up in an excel spreadsheet and calculate total cost. It sounds like you are going to spend 3k just to keep it in good shape.

Are you keeping this car for personal reasons or financial reasons? Maybe you could take a look at a new basic axia e spec.

Anyway, there's no transmission filter for the manual tranny. The 75w90 fluid change should cost like rm70 Total to change, and you can also add transmission treatment if you'd like.