Filters 52 November 2026 ǁǁǁ͘ ĂŌĞƌŵĂƌŬĞƚŽŶůŝŶĞ͘ ŶĞƚ Are extended service intervals making filtration harder? Gary Winslow, Product & Marketing Manager – Aftermarket at filtration specialist MANN+HUMMEL (UK), explores the impact longer service intervals are having on vehicles’ filtration technology and outlines what this means for the independent aftermarket. Service intervals on modern vehicles have crept steadily upwards. Where 10,000 miles or 12 months was once the norm, many manufacturers now offer longlife or condition-based service regimes stretching to 18,000 to 20,000 miles, or two years, depending on how the car is driven. For mechanics and parts suppliers across the independent aftermarket, the question is whether filtration technology has genuinely kept pace, or whether we are simply asking filters to do more with less support. Filtration physics hasn’t changed A filter’s job is unchanged: trap contaminants, protect the oil’s chemistry and keep flow consistent under all conditions. What has changed is the workload. Over an extended interval, an oil filter must hold significantly more soot, sludge, and wear-and-tear material without clogging or triggering its bypass valve prematurely. Research into extended-interval operation shows degradation is rarely linear. Once a filter’s dirt-holding capacity is exceeded, performance can fall away quickly rather than gradually, sometimes with catastrophic failure. Severe duty cycles expose the gap Manufacturer intervals are typically calculated for ‘normal’ use. UK driving, i.e. short urban trips, stop-start traffic, cold starts, and increasingly hybrid powertrains with frequent engine cycling often falls into the ‘severe’ category, where oil and filters degrade faster than the dashboard reminder icon suggests. This is where a filtration mismatch becomes costly: a standard or lower specification filter run to a long-life interval under severe conditions is simply a different proposition to the same filter run under ideal driving or motorway conditions. What this means for the Aftermarket For workshops and parts suppliers, three points matter most: O Spec matters more, not less. As intervals extend, filter media, valve design and housing integrity need to be engineered for the full extended duty cycle, not a lighter-duty assumed timescale. Using a filter not designed for long-life service effectively shortens the real interval, whatever the dashboard says. O Advise on usage, not just mileage. Technicians are well placed to flag when a customer’s driving pattern, e.g. short trips, towing, urban stop-start, means the official interval is optimistic, and a shorter, more conservative change is the safer recommendation. Explaining the fitment of OE specification filters, such as MANNFILTER (possibly at a slightly higher invoice value) is also a value add and shows real garage competence, not just a ‘fast-fit and out’ mentality. O Quality filtration protects warranty and emissions compliance. The Block Exemption Regulation protects independent servicing using parts of ‘matching quality,’ but that only holds if the filter genuinely performs to specification across the full interval; cutting corners on cheaper products can have repercussions that threaten the workshop and mechanic’s reputation and cause costly repairs and hassle. Extended service intervals need premium filtration Extended service intervals are not inherently a filtration problem, but they remove the margin for error. Filters built to a genuine long-life specification, correctly matched to the vehicle and realistic duty cycle, remain fully capable of protecting the engine for the full interval. The risk lies in treating longer intervals as ‘the same filter, just left in longer.’ For the independent aftermarket, the opportunity is clear: expert advice on real-world intervals, backed by filtration engineered for the job, is a value proposition and can outmatch many fastfit chains or even main dealers. www.mann-hummel.com
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