XL Synthetic Motor Oil: Stronger for Longer

The new XL Synthetic Motor Oil formulation delivers more cleaning power, complete protection against oil breakdown and new extended-drain recommendations.

XL Synthetic Motor Oil (XLZ, XLM, XLF, XLT, XLO)

XL Synthetic Motor Oil features a boosted formulation that delivers more cleaning power and promotes longer engine life. It’s engineered for advanced automotive technology, including turbochargers and direct injection. XL is the perfect choice for enthusiasts who want to do something extra for their vehicles. The new formulation will become available in October or when current inventory is depleted.

Formulation Change? Yes
New Stock Numbers? No
Price Change? No

  • 25 percent more cleaning power1
  • Achieved 100 percent protection against LSPI2
  • Extra protection that lasts up to 12,000 miles or 1 year, whichever comes first
  • API-licensed to meet the requirements commonly found in owner’s manuals

Fights Breakdown

XL Synthetic Motor Oil maintains its fluidity (viscosity) under the most extreme conditions. Some oils break down after extended periods of high- or low-temperature operation. These viscosity changes can lead to numerous issues:

  • Excessive oil consumption
  • Engine deposits
  • Accelerated wear
  • Difficult cold starts

The GM Oxidation and Deposit (GMOD) engine test simulates severe operating conditions to assess a motor oil’s 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 breakdown, ensuring protection in extreme temperatures.3

XL = Extended Life

AMSOIL XL Synthetic Motor Oil now provides even longer-lasting engine protection. Drain intervals can now be extended up to 12,000 miles, one year or longer when recommended in owner’s manuals or indicated by electronic oil life monitoring systems. This recommendation extends to aftermarket, original equipment manufacturer (OEM) or AMSOIL Ea® Oil Filters as well – simply replace the filter at every oil change.

Protects Pistons from Low-Speed Pre-Ignition

Like Signature Series and OE, XL features an advanced detergent system to protect vital engine parts like pistons and connecting rods. Most new engines feature gasoline direct-injection (GDI), often combined with a turbocharger to boost power and improve fuel economy. These new technologies pose significant challenges to motor oil, one of which is low-speed pre-ignition (LSPI). LSPI is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. It occurs in today’s advanced engines and is much more destructive than typical pre-ignition.

OEMs like GM* have addressed the issue by designing tests to determine a motor oil’s ability to prevent LSPI. The GM test allows up to five LSPI events to receive a passing score. XL Synthetic Motor Oil provided 100 percent protection against LSPI2 – zero occurrences were recorded.


1vs. AMSOIL OE Motor Oil

2Based on independent testing of AMSOIL XL 5W-30 Motor Oil in the LSPI engine test as required for the GM dexos1® Gen 2 specification.

3Based on the GMOD engine test required for the GM dexos1® Gen2 specification.

*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

07Mar 2018
Making synthetic oil

Are all Synthetic Oil Groups the Same? Group III vs IV vs V John Baker|Feb 06, 2018 11:27 AM The simple answer No. In fact, there are wide performance differences between base oil categories. Generally speaking, Group IV base oils offer the best performance, Group III second best, and so on in reverse order. But […]

07Mar 2018
Oil Life Monitor

Oil Life Monitors – Everything You Need To Know Josh Kimmes|Jan 22, 2018 3:31 PM For the past couple months, every time I start my truck I hear an annoying “ding” followed by an equaling annoying message saying “Change Engine Oil Soon.” I know what you’re thinking – you’d better change your oil! My oil […]

06Mar 2018
Warranty Secure

Your Polaris, Ski-Doo and Arctic Cat Dealer Can’t Void Your Warranty for Using Aftermarket Parts or Lubricants Andy Arendt|Jan 18, 2018 8:47 AM As in the automotive market, original equipment manufacturers (OEMs) have introduced new snowmobiles, UTVs and other powersports equipment with advanced materials and new technologies. Prices have risen considerably the past 10 years, […]

06Mar 2018
Dobie Gillis Statue thinking w/ Amsoil cap

Your Most Common Motor Oil Questions Answered Ed Newman|Sep 29, 2017 11:14 AM One thing the Internet has done is create a lot more “experts.” In the old days when you had a car maintenance question, you knew whom to ask – ‘ol Mike up the street with grease under his fingernails and a rag […]

06Mar 2018
Sema car on Ford

On the Road to SEMA with Chris Mangum of MAD Industries Ed Newman|Oct 30, 2017 9:40 AM It’s been a lot of fun going to SEMA these past 21 years. SEMA seemed big even back then when the South Hall of the Las Vegas Convention Center didn’t exist yet. Today it’s massive and still bursting […]

06Mar 2018
clean your battery terminals with AMSOIL MP

How to Clean and Prevent Battery Terminal Corrosion John Baker|Mar 27, 2017 10:46 AM We’ve all been there before. You turn the key on your car and…nothing. Not even the tell-tale clicking sound of the starter solenoid. Your first reaction is to pound the steering wheel and curse the darkness. But it should probably be […]