The Opel F40 is the six speed manual designed for GM's stronger turbo and diesel engines (around 400 Nm) (Astra H/J, Insignia, Zafira B/C and others). The typical fault is the oil level.
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Leaks do happen; and if the level drops, the synchro rings wear quickly (a stiff or scratchy shift). At high mileage the input shaft bearing can whine. Rare but documented: gear damage from a sudden shift at high revs.
The oil change is about every 50,000 km, and the fill is about 3.2 litres. The "lifetime" promise does not replace that.
between 120,000 and 250,000 km
What to check
- Look for oil leaks on the gearbox casing and the shafts: a low level means fast synchro wear
- Try every gear cold and warm: scratchiness, binding
- When warm, at open road speed, listen for input shaft whine
