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Possibly the most common Aston Martin fault - as these cars in particular the older models are known to consume quite a fair bit of oil, especially when driven daily.
Depending on how these cars are driven a common replacement is the clutch. Owners tend to enjoy the beautiful rasping engine note, often accelerating hard before it's fully engaged - causing premature wear. It's been known to only last 15-20,000 miles, depending on how the vehicle has been driven.
Something to replace to keep an older model DB7 mechanically pristine and safe is the wishbone bushes, in particular the aged and higher mileage ones. If you can feel a kicking sensation when maneuvering through a medium-fast corner - the upper wishbones are possibly something to investigate and replace.
Ignition coils create a spark for each cylinder within the engine whether it's the V8 or V12 version - it affects all models. Usually, a warning light will appear to notify of the issue, but sometimes, and with older cars this may not be the case. If you sense the worsening of fuel economy, the car perhaps is backfiring a little more often, and has a slight jumpy feel - these may need some attention.
Starting the vehicle cold is a common giveaway especially if the vehicle has been stored away for some time without being started.
The benefit of a regular replacement is huge: saving of fuel mostly, reduction of emissions and a smoother more instant drive.
If water/moisture seems to be appearing in the front foot wells - it can be caused by one of two things. Worn out or faulty door seals, or a leaking scuttle pane. Upon investigating the vehicle, if the door seals are at fault these would require replacing. More urgent however is the failure of the scuttle panel. If this is the cause of water in the footwell it's something to be replaced urgently as the water maybe trickling down onto the cooling fan motor, and this isn't a cheap replacement should this unit become water damaged.
As part of the maintenance for internal water leakage (as well as the replacement parts), the carpets and underlining must be removed and dried out thoroughly to prevent a musky, damp smell from appearing inside the cabin.
A common issue with older Aston Martin's is cracks of the exhaust and manifold especially if the vehicle has been driven hard over a period of time. But these are usually age related, caused by extreme hot temperatures (the expansion and contraction of the system). If you notice a change in engine note; a more deep growly sound, or even a drop in power - then it's likely to be a manifold or exhaust issue, requiring maintenance.
Sometimes, on older Aston Martin's problems can occur with the automatic control system. Usually, it's a failure of the evaporator which is not expensive to replace - however the cost of labour can be hefty, as the dashboard may need to be removed.