Figges Marsh queues, diesels and diluted oil
Mitcham driving is stop and start by design. The Fair Green stretch of London Road is buses and cycles only, so general traffic threads the one-way system instead. The Figges Marsh signals where London Road meets Streatham Road and Locks Lane queue at peak times, and the bridge over the railway and tram lines on Carshalton Road is another pinch point. Traffic like that runs the engine for a long time while the wheels cover almost nothing, and oil keeps score of the time.
For diesel drivers there is a second effect that catches people out. A particulate filter regeneration needs a sustained run to complete, and an attempt that is cut short by a junction leaves diesel in the sump. Repeated often enough, the oil level rises above the maximum mark and the oil itself thins, which is the opposite of what most drivers expect a problem to look like. Oil that smells of fuel or sits over the top mark on a Mitcham diesel is worth showing us rather than ignoring.
So we look at the oil before we drain it. We note the level, how it feels and whether it smells of fuel, and tell you what that suggests about how the car is being used. If a particulate filter is fitted, the refill is a low-ash oil carrying your engine's approval. The filter is renewed with the O-rings from the kit and its housing tightened to its figure, because the plastic ones crack when they are leaned on, and that is a leak you do not want.
The route runs south on London Road to the Cricket Green, along Cranmer Road onto Carshalton Road and over the railway by Mitcham Junction, becoming London Road again at Beddington Corner. Soho Mills is a few minutes past that, and Vestry Hall is a useful landmark for the start of the journey. Collection and delivery can be arranged, and you will have a written price before any work begins.

