Why the wet patch is never where the leak starts
Rosehill driving includes a decent share of open road. The A217 along Bishopsford Road and the A297 up St Helier Avenue are dual carriageways where traffic moves, and that airflow under the car is what makes oil leaks so misleading. At thirty or forty miles an hour, oil escaping at the front of the engine is driven rearwards along the sump, over the bellhousing and onto the exhaust before it ever falls. Park by the hospital or the old Gaumont parade and the patch appears under the middle or back of the car.
This is where money gets wasted. Replace the part nearest the wet patch and there is a fair chance the leak is unchanged, because the oil was only passing through. On a higher-mileage car there may also be more than one source at once, so even a correct repair can leave something still dripping and the impression that nothing was achieved. Neither problem can be solved by looking harder at a dirty engine.
The only reliable method is to remove the history. We steam clean the engine and underside so no old oil remains anywhere, add a measured dose of ultraviolet dye to the sump, and run the car or return it to you for a few days of normal use. Under a UV lamp the dye glows at the precise point it escapes, and an inspection camera reaches up the bellhousing and behind the timing cover where nothing can be seen directly. Where there are two sources we tell you which matters now.
Nine minutes down Wrythe Lane and Hackbridge Road makes this easy to split across two short visits rather than one long one. If the level is low, say so when you call and we will talk about collection instead. After any repair the area is cleaned again, the car is brought up to temperature and road tested, and it goes back on the ramp so we can confirm it is dry before you collect it, with our 3-month workmanship warranty behind the work.