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Originally Posted by Daily Telegraph Motoring
Petrol wrecks diesel engine lubrication processes and is particularly damaging to a diesel engine's costly, high-pressure fuel pump, which operates at up to 2,050bar (30,000psi). Petrol removes the pump case hardening and if a film of hardened metal disintegrates into swarf it will greatly harm or even wreck an engine's internal organs.
At best, if the engine is not started or perhaps run only very briefly, the fuel tank and its internal pump, fuel lines, main high-pressure pump, fuel injectors and filters will all require removal, clearing and re-installation (which might include some renewal) at a cost of up to £7,000. At worst, several parts will need replacing, even the engine itself, at a potential cost of £12,000, or more for a top executive car.
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