An automatic gearbox is a mechanical unit and does wear, along with the oil-degrading. The oil causes particles to move around the gearbox and pass through the filter units, this may sound worrying but is part of the design and works to trap and contain contamination.
Filter units now generally come as a kit with a new sump section, filters and seals. As part of a gearbox service, your filter will be changed. In some cases, we will offer you a choice of filter kits, often more times than not, valued 4×4 drivers will opt to upgrade to a metal filter kit ( rather than the standard plastic unit ) as this offers greater underside protection.
The filter kit market has started to become rather competitive and as with all products you get what you pay for. We will typically source an Original Equipment (OE) filter kit meaning that the kit we fit comes from the same factory as the ones supplied by the main dealer. A clean filter is important as it allows the smooth flow of the gearbox oil optimising driving performance and helping to extend the life of your gearbox.