What is “API SN PLUS”?
API SN PLUS is a new motor oil specification developed for turbocharged engines that is being developed in response to automakers request for motor oils that protect against Low-Speed Pre-Ignition (LSPI). LSPI is an engine condition known to occur in Turbocharged Gasoline Direct Injection (TGDI) engines that can be mitigated by changing the motor oil formulation.
Why does the industry need the “API SN PLUS” supplemental motor oil specification
- The API SN PLUS motor oil specification is intended to complement API SN and ILSAC GF-5 and aimed at addressing the increasing impact of Low-Speed Pre-Ignition in Turbocharged Gasoline Direct Injection (TGDI) engines.
- The high pressures from turbocharging combined with direct fuel injection into the combustion chamber in these smaller TGDI engines makes them susceptible to a phenomenon known as Low Speed Pre-Ignition, or LSPI. While the mechanism of LSPI is not yet fully understood, research has shown that motor oil properties may be a contributing factor. Automakers can mitigate LSPI by adjusting the engine operating conditions, but in doing so inhibit some high efficiency engine operating conditions.
- Amid growing concerns about LSPI among Automakers, the urgent need for a supplemental motor oil specification became evident. This new supplemental specification, known as API SN PLUS, includes the testing protocol for API SN and a special test for LSPI, the API Sequence IX test.
資料來源: pennzoil
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本文最後由 pompom 於 2018-9-27 03:45 編輯
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