Amsoil XL 10w40 Synthetic Motor Oil 3.78L (XLOQT-EA)

Amsoil XL 10W-40 Synthetic Motor Oil

Enhanced Engine Protection for Extended Engine Life

AMSOIL XL synthetic motor oil is the choice for those who want to do something extra for their vehicle. Its enhanced formula delivers additional cleaning power, outstanding wear control, excellent high and low temperature protection, and exceptional fuel economy. XL is engineered for advanced automotive technology, including turbos and direct fuel injection. It is packed with extra engine protection, allowing you to go up to 12,000 miles or one year, whichever comes first, between oil changes.

Prevents Oil Degradation

XL synthetic motor oil maintains fluidity (viscosity) under the most severe conditions. Some oils break down and significantly increase in viscosity after prolonged operation at high temperatures. These changes can cause excessive oil consumption, engine sludge, rapid wear, and difficult cold starts. The GM Oxidation and Sludge Test (GMOD) involves a 5.7L V8 engine running at 293ºF (100º hotter than normal) for 100 hours. These severe operating conditions test the oil's ability to control viscosity increase, sludge, and oil consumption levels. Testing shows AMSOIL XL synthetic motor oil provides more than 64% better protection against oil degradation compared to GM dexos1® Gen 2 specification requirements, ensuring protection under severe temperatures.

Piston Protection Against Low-Speed Pre-Ignition

XL synthetic motor oil features unique chemistry proven to protect your engine against the damaging effects of low-speed pre-ignition (LSPI)*. LSPI is the spontaneous ignition of the fuel/air mixture before spark plug ignition. Most new engines feature direct gasoline injection (GDI) systems, often combined with a turbocharger. These technologies increase the likelihood of LSPI events, which can destroy pistons and connecting rods. Properly formulated motor oil is critical to protect your engine against LSPI.

Original equipment manufacturers (OEMs) such as GM have addressed this issue by designing tests to determine motor oil's LSPI prevention capability. XL synthetic motor oil achieved 100% protection against LSPI2 – with no occurrences recorded throughout five consecutive bench test trials.

*Low-speed pre-ignition