I have this game.
In Stage one, you need to replace the AOS in under 2 hours.
If you do the oil filler tube while you in there, you get 10 points bonus.
In the second stage, you need to figure out, how the hell you measure the oil level in the car. Third stage, you need to replace the RMS, and install the new one to the correct depth. This stage is tricky, as the depth changes all the time
Then there are other stages when you need to detect if your coolest tank is leaking, try to figure out codes P0430 and P0420, and clean all the foam flakes coming out of the AC vent.
The highlight of the game is the last stage, when you need to replace the IMSB.
What a fun game.
