Coolant temp senders also fail a lot on PD diesels, its under the vacumn pump on side of head, been chaged from green colour to black bout £15.
Most important is to make sure its always had PD oil an not run on supermarket diesel as the high sulpher content in this makes em run poo.
Danny i would allow for an oil change wether it needs it or not, put some millers sport 4 diesel additive in it an give it a good thrash.
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