Smoke: Visible tailpipe emissions
aren't necessarily anything to worry about; petrol cars usually emit white
smoke on start up on cold days and diesels can produce black smoke, but
generally speaking this is nothing to worry about. However if you have smoke
where there was none previously, there's more of it than before or the colour
changes – blue smoke in particular indicates burning oil – then this indicates
a potential problem.
Noise: Even the quietest of used Japanese trucks make some noise and if you've owned your car for some time,
you should be familiar with how it sounds. A change in volume, pitch or a new
noise altogether could mean something is wrong. Knocking or tapping from the
engine could be a serious mechanical fault, clunking from the suspension could
mean a safety-critical fault and a whining or grinding sound could be a wheel
bearing or brake fault.
Fuel: If you use your car regularly,
you probably have a good idea of how much fuel it uses depending on the
journey, so a sudden increase in consumption could indicate an engine fault, or
even a fuel leak.

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