"The correct oil pumps are near impossible to find.
They are not the same as the NA motor oil pump. You may be better off
re-using your old one. The internals are different as well as the oil pressure
spec. If it were me, I would use the OE pump. If you think it's worn out, you
can take it apart and check for wear per the FSM.
Most online listings will list the normally aspirated oil pump as replacement
for Turbo motors, which is incorrect. You would need to verify the part # for
the correct replacement pump.
Normally aspirated engines used a gear type pump on the carbureted versions,
the turbo engines used a rotor type pump. Basically the pressure difference is
that the turbo rotor pump has an additional 5.9 psi over the na pump.
42.7-54 psi na vs. 42.7-59.7 psi turbo.
1985-1988 carbureted oil pump Suzuki part # 96062263
1987-1988 turbo version oil pump Suzuki part # 96057368 (1987), #96062527 (1988)
87-88 turbo pumps should be interchangeable"
