Why a mile to the shops is harder on oil than a long run
Most Carshalton journeys are measured in minutes, not miles. The A232 past the ponds is narrow and slow, with buses pulling in, people crossing and cars parked along the kerb, so a trip to the High Street or across to Carshalton Park can take ten minutes and cover barely a mile. An engine needs longer than that to get the oil hot enough to drive off the water and fuel that condense in the sump every time it starts from cold.
The climb up Park Hill and Beeches Avenue to Carshalton Beeches adds the other half of the problem. Pulling a cold engine up a gradient is the period of heaviest wear in any journey, because the oil is still thick and has not reached the bearings and the chain tensioner as readily as it will once it is warm. Do that twice a day, with a weekend run up to Oaks Park and little else, and the oil wears out on a timescale that has nothing to do with the mileage.
That is also why we warm the engine before we drain it. Hot oil carries far more of the suspended soot and sludge out through the sump plug than cold oil does, and on a car that only ever does short trips there is more of that waiting to come out. The plug goes back with a new washer and to its torque figure, the filter is renewed with the seals from the kit, and we refill to your engine's exact capacity.
Getting here is simple: north on West Street past the station, briefly onto Wrythe Lane, then Nightingale Road and Hackbridge Road to London Road. It is the kind of job you can drop in for, and collection and delivery can be arranged if that suits you better. You will have a written price first, and anything we notice while the car is up gets reported rather than quietly added.

