What LSPI? | Low Speed Pre-Ignition | AMSOIL
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Original equipment manufacturers (OEMs) have been aggressively downsizing engines to meet strict fuel-economy and emissions standards while improving power and torque. Most new engines today use some combination of turbochargers, direct-fuel injection and variable valve timing to make more power than their larger counterparts while delivering improved fuel economy.

This scenario seems like all up-side for drivers. But today’s smaller, hotter-running engines pose significant challenges to lubricants. The latest is a phenomenon called low-speed pre-ignition (LSPI), also known as "super knock," which can destroy pistons and connecting rods.


Vehicle manufacturers know this is an issue and have programmed vehicle software to avoid LSPI-inducing conditions. Doing so, however, limits fuel efficiency. To extract maximum efficiency from their advanced power plants, OEMs will soon implement software updates that will increase the risk of LSPI. After the software installation, engines without the protection of a motor oil formulated to combat LSPI will be at greater risk of severe damage. At AMSOIL, we’ve been hard at work preparing for these future OEM updates.

After months of vigorous testing, the results are in: AMSOIL synthetic motor oil provided 100 percent protection against LSPI in the engine test required for the GM dexos1 Gen 2 specification, proving it can protect turbocharged direct-injected engines.1

1Based on the LSPI engine test required for GM* dexos1™ Gen2 specification.

Oil Coming Soon

The complete AMSOIL motor oil lineup will be upgraded to meet these challenges. Stay tuned.


Contact your full-service AMSOIL Dealer or AMSOIL Technical Services at 715-399-TECH (8324).