Extended Life 10W-40 100% Synthetic Motor Oil

XL (Extended Life) 10W-40 Synthetic Motor Oil maintains its fluidity (viscosity) under the most extreme conditions. Some oils break down and significantly increase in viscosity after extended periods of high-temperature operation. These changes can cause excessive oil consumption, engine deposits, accelerated wear and difficult cold-starts. The GM Oxidation and Deposit (GMOD) Test consists of a 5.7L V8 engine running at 293ºF (100º hotter than normal) for 100 hours. These severe operating conditions test an oils ability to control viscosity increase, deposits and oil consumption. The testing revealed that AMSOIL XL Synthetic Motor Oil provides 64 percent more protection against oil breakdown¹ than required by the GM dexos1® Gen 2 specification, ensuring protection in extreme temperatures.

“It’s a real bargain – longer life – and better performance than all big name top-tiered synthetics yet the XL costs less.” – Ches Cain

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

Resists Oil Breakdown

XL Synthetic Motor Oil maintains its fluidity (viscosity) under the most extreme conditions. Some oils break down and significantly increase in viscosity after extended periods of high-temperature operation. These changes can cause excessive oil consumption, engine deposits, accelerated wear and difficult cold-starts. The GM Oxidation and Deposit (GMOD) Test consists of a 5.7L V8 engine running at 293ºF (100º hotter than normal) for 100 hours. These severe operating conditions test an oils ability to control viscosity increase, deposits and oil consumption. The testing revealed that AMSOIL XL Synthetic Motor Oil provides 64 percent more protection against oil breakdown¹ than required by the GM dexos1® Gen 2 specification, ensuring protection in extreme temperatures.

Download Product Data Bulletin

Download PDFProduct Datasheet

Protects Pistons from Low-Speed Pre-Ignition

XL 5W-20 Synthetic Motor Oil features unique chemistry proven to protect your engine against the harmful effects of low-speed pre-ignition (LSPI). LSPI is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. Most new engines feature gasoline direct-inject (GDI), often coupled with a turbocharger. These technologies heighten the possibility of LSPI events, which can destroy pistons and connecting rods. A properly formulated motor oil is critical for protecting your engine against LSPI.

Original equipment manufacturers (OEMs) like GM have addressed the issue by designing tests to determine a motor oil’s ability to prevent LSPI. XL Synthetic Motor Oil achieved 100 percent protection against LSPI² – zero occurrences were recorded throughout five consecutive tests.

Keeps Engines Clean

AMSOIL XL 5W-20 Synthetic Motor Oil is fortified with detergent and dispersant additives. Its boosted additive package effectively raises the total base number (TBN) to neutralize acids and resist sludge, corrosion and carbon deposits. XL was improved to now provide 37 percent more cleaning power³ to help keep your engine running smoother, longer.

• 37% more cleaning power¹ to help keep your engine running smoother, longer.
• Protects against LSPI
• 20,000 miles of guaranteed protection between changes²¹Compared to AMSOIL OE Synthetic Motor Oil.
  ²Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

Reduces Maintenance

Motorists, business owners and fleet managers benefit from the boosted engine protection of AMSOIL XL Synthetic Motor Oil. Frequent oil changes are expensive, time-consuming and inconvenient. The extra protection built into XL can provide extended drain intervals up to 20,000 miles or one year, if you choose, allowing you to change oil on your schedule, reduce maintenance, save money and reduce waste oil.

Maximizes Fuel Economy & Maintains Low Emissions

Extended Life 10W-40 Synthetic Motor Oil is licensed by the American Petroleum Institute (API) to meet and exceed the requirements commonly found in owner’s manuals. It excels in fuel-economy testing, earning the additional “Resource Conserving” designation⁵ from the API. XL is also friendly toward modern emissions control systems, promoting proper operation of catalytic converters for optimum service life and low exhaust emissions.

APPLICATIONS

Use AMSOIL XL Synthetic Motor Oil in applications that require any of the following specifications:

10W-40 (XLO)

• API SQ, SP, SN PLUS; ACEA A3/B3, A3/B4

COMPATIBILITY

AMSOIL XL Synthetic Motor Oil is compatible with conventional and other synthetic motor oils. Mixing other oils with AMSOIL motor oils, however, will shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL XL Synthetic Motor Oil.

Service Life

Normal Service: In gasoline-fueled vehicles, AMSOIL XL Synthetic Motor Oil is recommended for up to 20,000 miles or 1-year!  It can be extended further than one year when recommended in owner’s manuals or indicated by electronic oil life monitoring systems. Change the filter at every oil change regardless of filter brand.

Severe Service: – Up to 12,000 miles or one year, whichever comes first. Severe service conditions include commercial or fleet vehicles; long idling; or frequent towing, hauling, plowing or driving on dirt or dusty roads.

• Modified or non-stock engines, racing, cars using alternative fuels (E85, CNG, propane, etc) are excluded from extended intervals.
• AMSOIL Oil filters are designed for extended drain intervals. Do not exceed 12,000 miles (20000 KM) or one year with other brand filters unless longer intervals are recommended by the vehicle manufacturer. Always change filter when changing oil.
• Check oil regularly to maintain proper fill levels. AMSOIL Oil filters stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Oil Filters.

Buy & Check Price& Bottle Sizes

AMSOIL PRODUCT WARRANTY

Using AMSOIL synthetic lubricants or practicing extended drain intervals does not void your new vehicle or equipment manufacturer’s warranty. All AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information/.

Customer Reviews on the Extended Life!!