Hi bro zorden,
i think your company opel car might be very old or over used (V high mileage)liao la..!
Normally, a japanese car with mileage of 80k do need a overall service, like changing timing, fan belt..etc, which most likely about cost about ~1.3K only.
The basic per maintainence for my 1 year++ 2.0 cefiro is only cost about 0.3k ++ , unless it's BM, Volvo, Saab or Benz mostly cost about 0.6~1k .
cheers.