Cold starts, shift patterns and the six-way roundabout
A lot of Rosehill motoring runs on hospital time. St Helier sits at the end of Wrythe Lane, and cars belonging to staff and visitors are started cold at six in the morning or eleven at night, driven a couple of miles and switched off. Number of cold starts, not number of miles, is what loads up a sump with condensation and unburnt fuel, so a car doing modest annual mileage in short bursts is working its oil hard. The engine simply never stays warm long enough to clear it.
The roads here pull in two directions. The six-way Rose Hill roundabout is one of the area's real pinch points, with queues, lane changing and constant bus traffic, and Wrythe Lane past the hospital is busy with ambulances and parked cars all day. Then the A217 and A297 dual carriageways open up and move quickly. That mix of crawling and brisk running is normal for a car used around here, and it means neither the mileage nor the time alone tells you the whole story.
Because the trip is short we try to make the visit short too. Most oil changes take 30 to 60 minutes once the engine is at temperature, so an early slot before a shift or a late one after it usually works. We confirm the approval your engine needs, use a low-ash oil where a particulate filter is fitted, reset the oil life indicator and write the grade, filter, date and mileage on your invoice so you always know where you stand.
The route is Wrythe Lane south-east past the hospital to Wrythe Green, then Wrythe Green Road onto Nightingale Road and Hackbridge Road, joining London Road near Hackbridge station. We are open from 8am to 8pm Monday to Friday and 8am to 5pm on Saturday. You get a written price first, and if the car needs repair work on top of the oil change, that work carries our 3-month workmanship warranty.

