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New Millers Oils lubricant combats Low Speed Pre Ignition (LSPI)

November 12, 2018




Damaging phenomenon alleviated by latest engine lubricant


Brighouse, UK, 12th November, 2018... Millers Oils is one of the first companies to market with an LSPI oil, that solves the increasingly common problem found in downsized gasoline direct injection engines that can cause extensive damage. The new lubricant is available from November and provides workshops with a simple, quick and cost-effective solution to the growing problem.


“LSPI, Low Speed Pre Ignition, has become a serious issue for owners of some downsized, heavily boosted GDI engines, with growing numbers of requests to our helpline for advice,” says Martyn Mann, Millers Oils Technical Director. “By using a new detergent additive pack, we have been able to blend an oil that significantly reduces the likelihood of pre-ignition, which can cause severe engine damage. It is a fantastic opportunity for workshops to offer a simple, cost-effective solution to customers to such a big problem.”


LSPI, sometimes called ‘super knock’, occurs when oil from the cylinder wall mixes with freshly injected fuel and atomises, creating a mixture that spontaneously ignites when compressed by the rising piston, before the timed spark occurs. This results in a rapid and uncontrolled rise in pressure which can cause irreparable damage to pistons, rings, cylinder head and con rods, even leading to complete engine failure. It only takes place when an engine is operating at large throttle openings and low to moderate speed, typically around 2000rpm.


LSPI has become more common since car manufacturers adopted downsized engines with very high combustion pressures as a means of reducing emissions and improving efficiency, according to Mann. “The film of oil on the cylinder wall that causes LSPI has always been present in engines but, until recently, turbocharged gasoline engines were either used in high performance derivatives, driven mostly at high rpm, or in light pressure applications with very modest boost levels, making LSPI unlikely,” he explains. “Today’s engines, developed for high efficiency, regularly run at low speed and high boost while direct injection of the fuel dilutes the oil, making it easier to atomise. These are ideal conditions for LSPI; it’s a perfect storm.”


Research has shown that reformulating the detergent additive used in the engine’s lubricating oil can greatly reduce the risk of LSPI when the oil is new, but not all such reformulations are effective throughout the life of the oil. Millers Oils replaces current detergent additives with a hybrid combination of chemistry, which has been found to suppress LSPI throughout the service interval until the next oil change.

Millers Oils’ prompt reaction reflects its close relationship with end users, through its technical helpdesk, and the inherent ability of an agile, smaller company to respond quickly to changing market pressures. Meeting the standards of ISLAC GF6 and API SN Plus, the new blend XF Longlife LSPI 5w30 is offered in five and one litre bottles as part of Millers Oils’ fully synthetic Premium Longlife range in various grades, alongside existing EE and XF products. Further information is available at

Anthony Hornsby
+44 (0)1295 277050 (office)

About Millers Oils
Millers Oils was founded in 1887 by John Watson Miller, and since then has displayed its talent for innovation and industry firsts through its status as a leading UK independent blender of oils and lubricants. Its expertise extends across a range of sectors and applications, from motorsport to off-highway, commercial to industrial. Renowned for its innovation, it devotes an equivalent
R &D effort to its broad range of industrial lubricants as it does in areas such as its NANODRIVE reduced friction technology motorsport range.  Its products are used by a wide range of companies including many household names.

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