OK my advice would be..pre supposing the vehicle has been regularly serviced and there is no management light showing...
..
1) buy some Cataclean diesel treatment...
once you have run that thro then
2) fill with decent Shell V power and take car fora run -- at least 40 minutes at differing speeds , flooring it on acceleration thro the gears a couple of times.
stay well away from supermarket crap if you use it in the future.
If you really want to give it a birthday then you can also run an injectior cleabner thro it. Cheaer than loading up a parts cannon
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Clive
"Lets turn up the juice and see what shakes loose"
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