BMW F10 5 Series N57 Diesel Injector Seal Leak
The copper sealing washers on N57 injectors (6 total) degrade at high mileage, allowing diesel to enter the rocker cover area. Diesel smell in the cabin and oily/sooty residue around injector bases confirm the fault. Six-injector seal replacement at N57 access labour costs £500-900. Oil dilution requires immediate oil change.
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