February 2020

past, a higher sulphur content in the oil was desirable because the sulphur helped reduce friction. Modern diesel vehicles with exhaust gas treatment generally require a low-SAPS oil that is especially low in ash. The free online oil guide at www.liqui- moly.com tells you exactly which oil is right for which vehicle. A quick check in the oil guide is the simple and reliable way to avoid technical problems and customer damage claims.” If the DPF is clogged with soot, LIQUI MOLY offers a cleaning kit that clears the filter without having to remove it. “This is quick and it costs the customer less than having to go to the trouble of removing the filter – let alone replacing it,” observed David. “A garage that helps a customer save money gains a regular customer. “LIQUI MOLY Diesel Purge helps prevent soot from forming in the combustion process and clogging the particulate filter. Combustion residues accumulate at the openings of the injectors. As a result, the diesel fuel is no longer atomised as finely. The combustion process becomes less clean, producing even more combustion residue which attaches itself to the nozzle openings – a vicious circle that becomes is reflected in an increasing loss of engine power, higher fuel consumption and deteriorating exhaust gas levels. More often than not, drivers remain unaware of what’s happening because the process is so slow. David continues: “Diesel Purge is a highly effective cleaning agent that dissolves incrustations and removes deposits from the nozzle openings. It is used in undiluted form. The easiest way to do this is via the fuel filter if it has to be replaced anyway. Instead of filling the new filter with diesel fuel, simply fill it with Diesel Purge. The engine then likewise runs for a short time on additive alone to remove even the most stubborn deposits. This type of application can also be used as part of a routine tune-up. “After this diesel treatment, the engine runs smoothly again, delivering its full power as well as its original fuel consumption levels. In order to keep things that way, the garage can then sell the customer a few cans of LIQUI MOLY Super Diesel Additive. This is a cleaning additive that keeps the injectors clean while also improving the cetan number. Car owners can apply it themselves: simply empty a can into the fuel tank every 1250 miles when refuelling. “Our additives are not only effective, they’re also easy to use and offer garages high-margin additional trade,” concluded David. Future Despite current concerns, diesel tech continues to develop, as DENSO Assistant Manager (Aftermarket Network UK and Ireland), Mike Sadler observed referring to the company’s OE output: “The company has invested significantly in research and development over the decades, often in partnership with vehicle manufacturers, to pioneer increasingly-efficient, powerful and reliable diesel engines with minimal emissions. As an example, DENSO introduced the world’s first 1,800bar common rail fuel system with Piezoelectric – or Piezo for short – injectors. These are at the heart of common rail diesel design; their ‘crystal’ material generates an electrical charge when a mechanical stress is applied. The crystal will quickly expand, meaning it can act as an actuator. “Most recently, DENSO launched i- ART technology. i-ART places a miniature pressure sensor in each injector – another world first – to monitor injection activity. As fuel 38 AFTERMARKET FEBRUARY 2020 DIESEL Above: Using the wrong oil may clog the diesel particulate filter www.aftermarketonline.net injection occurs up to 1,000 times per second, i-ART measures the fluctuation of fuel pressure and temperature in each injector, to deliver optimum control of the injection amount and timing. The results are a clean, quiet and fuel-efficient performance. “i-ART was promoted as one of the unique selling points of Volvo’s eco- friendly Drive-E engine, proving DENSO was at the forefront of greener diesel technology. DENSO also unveiled a world-first when it launched the highest common rail injection pressure of 2,500bar, helping to increase fuel efficiency by 3%.” Mike continued: “There are five DENSO-approved service centres in the UK – Carwood, Merlin Diesel, Feather Diesel, Colchester Fuel Injection and CP Diesel – all of which are part of the DENSO Service Network, which specialises in air conditioning, diesel and diagnostics. The pan-European network of highly-skilled, DENSO-accredited distributors and workshops are able to diagnose and repair advanced and complex original equipment on a growing range of vehicles. DENSO’s remanufacturing facility in the Netherlands, meanwhile, provides the same care and attention as its OE counterparts – high quality, durability and reliability – but for a shade of the cost and it benefits the environment.”