A seal in the 4 cylinder engine around the balance shaft tends to fall out, causing a large oil leak. There is a retaining device available to prevent the seal from falling out, which can be put in place during routine timing belt maintenance.
Car problem reports
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Most reported 1999 Isuzu Oasis problems
There is an issue where the transmission can have a torque converter problem, or the computer monitoring the torque converter can misinterpret the information, and in either case this can cause the Check Engine Light (MIL) to illuminate. The problem will need to be diagnosed and depending upon what is causing the issue, the transmission will have to be repaired or the computer replaced.
The AC evaporator can collect mold and give a foul smell. The evaporator will have to be disinfected or replaced to repair this issue.
The AC evaporator drain can clog and cause a water leak inside the vehicle, usually on the passenger floor. Cleaning the drain will fix this problem.
The front brake rotors can warp and cause a vibration when braking. The rotors will need to be machined or in cases where they are worn to thin, replaced to correct this issue.
On certain models moisture can get into the rear wheel bearing and cause a noise. Replacing the rear wheel bearing is needed to correct this concern.
On certain models the fuel gauge will not read full due to excessive resistance in the sending unit. Replacing the sending unit in the fuel tank will commonly repair this issue.
Worn engine mounts can cause engine noises and vibrations felt through the steering wheel along with rattles in the dash area. Replacing damaged mounts will smooth things out.
Engine oil leaking into the distributor can cause an engine misfire. Replacement of the distributor will be necessary to correct this concern.
The engine block can crack behind the exhaust manifold and cause an oil leak. Depending upon the severity of the crack it can be sealed to stop the leak.