[acshortt5]

If not done already then I think the following (in addition to what's already been said) will need doing to get to 300k miles:

They do rot, but only in 2 places (that I know of): the rear exhaust hanger and the fuel filter bracket.

Headlight reflectors go dull & the silvering WILL come off when you try to polish it.

The steering racks aren't brilliant, particularly the later SMI rack where a bracket breaks and has to be welded. Inner track rods will develop play but are easily replaced.

Engine mounts (lower front, lower rear (PITA on a turbo car), side (under cambelt), gearbox mount and top mounts will need doing.

Fuel pump relay.

Heated front seats - was subject to a recall, make sure it's been done.

Headlight switch - again was subject to a recall, make sure it's been done.

Aux belt - the change interval is less than the cambelt. Leave it too long and it will snap, wrap round the cambelt and wreck the engine.

Radiator (particularly auto's and manuals up to 99 that have oil coolers). They can break causing oil to mix with coolant which may show the signs of head gasket failure with engine oil or wreck an autobox.

Rear shock upper mounts - replace with the nivomat mounts which are a lot stronger.

ABS ecu - solder joints fail causing various spurious fault codes.

Obviously other normal service stuff will need doing as well.