have a 1995 CB8, powered by a 4D68 2 ltr, its a brand new, has 214000 on the clock, and does 13 kmpl in city and 16+ kmpl on highway, the vehicle pulls well, and and no major repairs were done i its life time ( yes, no overhaul), there are little drops of engine oil leaking from the air filter, but no significant oil loss,
as i have experienced..
advantages are
1. low cost on fuel, and better efficiency.
2. Torque- which helps to shift at low RPM , low RPM helps he engine to live longer,
3. since its a manual it can keep up with many vehicles on the road,
disadvantages are
1.high cost on services as you already know,
2.high vibration causes few problems, engine mounts expire early, dash broads get all rattling,
3.low acceleration.
4.repair costs make you helpless,