JASO M 364 is a Japanese Automotive Standards Organization specification for passenger car gasoline engine oils, focused on ultra-low viscosity grades such as 0W-8 and 0W-16. It establishes minimum requirements for HTHS viscosity, fuel economy improvement, phosphorus concentration, LSPI protection, and evaporation loss.

The Engine Oil Standard Behind Toyota and Honda Ultra-Low Viscosity Requirements

JASO M 364

JASO M 364 is the Japanese Automotive Standards Organization specification governing engine oil performance for passenger car gasoline engines, with particular emphasis on ultra-low viscosity engine oil grades such as 0W-8 and 0W-16. Developed to address the lubrication demands of modern Japanese powertrains — where fuel economy targets and tight component tolerances push oil viscosity below ranges covered by American standards — JASO M 364 establishes distinct requirements for HTHS viscosity, fuel economy improvement, phosphorus content, and anti-wear performance.

Understanding the JASO M 364 oil standard is relevant for owners of late-model Toyota and Honda vehicles that specify 0W-8 or 0W-16 engine oil, and for technicians navigating the difference between JASO, API, and ILSAC engine oil certification frameworks.

What Is JASO M 364?

JASO M 364 is an engine oil specification developed by the Japanese Automotive Standards Organization (JASO) to define performance requirements for ultra-low viscosity passenger car engine oils. The standard was introduced to support modern Japanese gasoline engines operating on 0W-8 and 0W-16 oil grades, where fuel economy, emissions compliance, and reduced internal friction require tighter control of oil properties than traditional API and ILSAC specifications.

JASO M 364 establishes minimum performance thresholds across multiple test parameters:

High-Temperature High-Shear (HTHS) viscosity, governing oil film strength under severe load conditions
Fuel Economy Improvement (FEI), measured against a reference oil using the JASO M 366 test method
Phosphorus concentration, balancing anti-wear protection with catalytic converter durability
Low-Speed Pre-Ignition (LSPI) protection, required for modern turbocharged direct-injection engines
Evaporation loss (Noack volatility), limited to 15.0% — aligned with API SP and ILSAC GF-6A

Unlike API SP and ILSAC GF-6A, which do not define requirements for 0W-8 engine oil, JASO M 364 serves as the primary specification governing these ultra-low viscosity grades.

The GLV-1 Grade Designation

JASO M 364 defines the GLV-1 (Gasoline Low Viscosity 1) designation as the performance category for ultra-low viscosity engine oils, specifically covering 0W-8 and 0W-16 grades. GLV-1 is a formal specification category, not a marketing label, and applies to oils engineered to meet the fuel economy and friction reduction requirements of modern passenger car engines.

The defining characteristic of GLV-1 oils is their reduced High-Temperature High-Shear (HTHS) viscosity. For 0W-8 engine oil, the minimum HTHS viscosity is 1.7 mPa·s, significantly lower than the 2.6 mPa·s minimum required for 0W-20 oils under ILSAC GF-6A. This reduction in viscosity directly contributes to improved fuel economy by lowering internal engine friction, but requires tighter control of additive chemistry and base oil formulation to maintain wear protection.

GLV-1 oils are designed for engines built with tighter internal tolerances, including modern Toyota Dynamic Force and Honda VTEC Turbo platforms. These engines are engineered to operate with thinner oil films while maintaining durability, emissions compliance, and thermal stability.

Because API and ILSAC specifications do not fully address 0W-8 engine oil, the GLV-1 designation under JASO M 364 serves as the primary classification for these ultra-low viscosity grades. For 0W-16 applications, GLV-1 overlaps with ILSAC GF-6B requirements but provides additional assurance of compliance with Japanese OEM specifications.

JASO M 364 vs. API SP and ILSAC GF-6A

JASO M 364 differs from API SP and ILSAC GF-6A primarily in its coverage of ultra-low viscosity engine oil grades, particularly 0W-8. While all three standards share similar requirements for wear protection, oxidation stability, and emissions system compatibility, JASO M 364 extends into viscosity ranges not fully addressed by American specifications.

API SP defines performance requirements for a broad range of engine oil viscosities but does not include a framework for 0W-8 oils. ILSAC GF-6A governs 0W-20 and higher viscosity grades, while GF-6B applies to 0W-16 oils. However, neither API SP nor ILSAC GF-6 fully establishes a dedicated performance category for 0W-8, leaving JASO M 364 as the primary specification for these ultra-low viscosity applications.

Across all three standards, key areas of alignment include Low-Speed Pre-Ignition (LSPI) protection, phosphorus limits to protect catalytic converters, and evaporation loss (Noack volatility) capped at 15.0%. Fuel economy performance is also addressed in each framework, though test methods differ — JASO M 364 uses the JASO M 366 procedure, while ILSAC relies on Sequence VIE and VIF testing.

Where JASO M 364 stands apart is in its direct focus on fuel economy optimization through reduced HTHS viscosity. By defining minimum HTHS values as low as 1.7 mPa·s for 0W-8 oils, the standard supports engine designs that prioritize efficiency while maintaining acceptable wear protection through advanced additive chemistry.

For 0W-16 applications, ILSAC GF-6B and API SP oils generally meet OEM requirements in North America. However, JASO M 364 GLV-1 certification provides additional validation for engines designed under Japanese domestic standards, particularly in Toyota and Honda platforms specifying ultra-low viscosity oil.

Parameter	JASO M 364 GLV-1	API SP	ILSAC GF-6A	ILSAC GF-6B
Applicable Grades	0W-8, 0W-16	Multiple	0W-20 and above	0W-16 and below
HTHS Min (0W-8)	1.7 mPa·s	—	—	—
HTHS Min (0W-16)	2.3 mPa·s	2.3 mPa·s	—	2.3 mPa·s
FEI Requirement	Yes (JASO M 366)	Optional (RC)	Yes (Sequence VIE/VIF)	Yes
LSPI Protection	Mandatory	Mandatory	Mandator	Mandatory
Noack Evaporation	≤ 15.0%	≤ 15.0%	≤ 15.0%	≤ 15.0%
Phosphorus	0.06–0.08%	≤0.08%	≤0.08%	≤0.08%

Automotive vs. Motorcycle Lubrication

JASO M 364 vs. JASO T 903

JASO M 364 and JASO T 903 are separate standards developed for fundamentally different lubrication environments. JASO M 364 applies to passenger car gasoline engines, while JASO T 903 governs engine oil used in four-stroke motorcycles.

The key difference lies in system design. Most motorcycles use a shared lubrication system for the engine, transmission, and wet clutch. This requires strict control of friction characteristics to prevent clutch slippage. JASO T 903 defines friction performance categories (MA, MA1, MA2, and MB) specifically to manage clutch engagement and compatibility with friction-modifying additives.

JASO M 364 does not include clutch friction requirements. Passenger vehicles use separate lubrication systems for the engine and drivetrain, allowing the use of friction modifiers that would be unsuitable in a wet clutch environment. These additives — including molybdenum-based compounds — are commonly used in ultra-low viscosity engine oils to reduce internal friction and improve fuel economy.

Because of these differences, oils meeting JASO T 903 MA or MA2 are not interchangeable with JASO M 364 GLV-1 oils. A motorcycle-specific oil may not meet the fuel economy improvement or HTHS viscosity requirements necessary for 0W-16 or 0W-8 engine oil applications. Conversely, a JASO M 364 oil may contain friction modifiers that would cause clutch slip in a motorcycle.

Selecting the correct specification is critical. JASO M 364 is designed for automotive engines requiring ultra-low viscosity oil, while JASO T 903 is engineered specifically for motorcycle systems with integrated clutch operation.

Molybdenum and Fuel Economy in JASO M 364 Oils

Friction modifier chemistry plays a central role in achieving the fuel economy targets defined by JASO M 364. One of the most commonly used additives in ultra-low viscosity engine oils is Molybdenum Dithiocarbamate (MoDTC), which reduces boundary friction between moving engine components such as piston rings and cylinder walls.

In ultra-low viscosity applications like 0W-8 and 0W-16, the oil film is thinner by design. As a result, friction reduction at the boundary lubrication level becomes more important. MoDTC forms a low-shear-strength film on metal surfaces, allowing components to move more freely while maintaining adequate wear protection. This directly contributes to improved Fuel Economy Improvement (FEI) test results under JASO M 364 and ILSAC GF-6 requirements.

The use of molybdenum-based additives is sometimes misunderstood due to their impact on wet clutch systems in motorcycles. Under JASO T 903, friction modifiers can reduce clutch engagement performance, which is why motorcycle oils limit or control their use. However, this restriction does not apply to passenger car engines governed by JASO M 364.

In automotive applications, MoDTC and similar friction modifiers are standard components of modern engine oil formulations. Their inclusion is not only acceptable but necessary to meet the efficiency and emissions targets associated with ultra-low viscosity oil specifications.

Which Vehicles Require JASO M 364 Oil?

JASO M 364 is most relevant for late-model Toyota and Honda vehicles designed to operate on ultra-low viscosity engine oils such as 0W-8 and 0W-16. These engines are engineered with tighter internal tolerances and optimized oil flow characteristics to support reduced viscosity while maintaining durability and emissions compliance.

In the Japanese domestic market (JDM), several Toyota Dynamic Force engines specify 0W-8 engine oil, making JASO M 364 GLV-1 the applicable standard. Honda has also adopted 0W-16 oil in a range of modern gasoline engines, particularly in turbocharged and fuel-efficient platforms.

In North America, 0W-16 engine oil is more commonly specified than 0W-8. For these applications, oils meeting ILSAC GF-6B and API SP generally satisfy OEM requirements. However, JASO M 364 certification provides additional assurance that the oil meets Japanese performance standards, particularly for engines originally designed for the JDM market or for owners following manufacturer-specific service documentation.

It is important to follow the viscosity grade specified by the vehicle manufacturer. An oil meeting a higher specification, such as API SP, does not compensate for using the wrong viscosity. For example, a 0W-20 engine oil — even if it exceeds API SP requirements — does not replace a 0W-16 or 0W-8 specification.

Always verify the required oil specification and viscosity grade using the owner’s manual or OEM service information. Both parameters must align to ensure proper lubrication performance, fuel economy, and emissions system compatibility.

Frequently Asked Questions

FAQ

What is JASO M 364?

JASO M 364 is a Japanese engine oil specification that defines performance requirements for ultra-low viscosity engine oils, including 0W-8 and 0W-16, used in modern passenger car gasoline engines.

What is the GLV-1 grade under JASO M 364?

“GLV-1 (Gasoline Low Viscosity 1) is a formal performance category within JASO M 364 for 0W-8 and 0W-16 engine oils. The GLV-1 designation requires a minimum HTHS viscosity of 1.7 mPa·s for 0W-8 grades and mandates fuel economy improvement verified using the JASO M 366 test method.

What is the difference between JASO M 364 and JASO T 903?

JASO M 364 governs engine oil for passenger car gasoline engines. JASO T 903 governs engine oil for four-stroke motorcycles with integrated wet clutch systems. The two standards have different friction modifier requirements: oils meeting JASO M 364 may contain molybdenum-based friction modifiers to achieve fuel economy targets, while JASO T 903 oils must meet clutch friction performance thresholds to prevent clutch slip.

Is JASO M 364 the same as ILSAC GF-6B?

No. JASO M 364 and ILSAC GF-6B both address low-viscosity oils including 0W-16, and share some requirements such as LSPI protection and Noack evaporation limits. However, they are separate standards administered by different organizations using different test methods. JASO M 364 uses the JASO M 366 test for fuel economy improvement, while ILSAC GF-6B uses the Sequence VIE or VIF. For most North American vehicles specifying 0W-16, ILSAC GF-6B certification satisfies OEM requirements.

Which Toyota and Honda engines require JASO M 364 oil?

JASO M 364 is most directly relevant to vehicles sold in Japan that specify 0W-8 or 0W-16 engine oil, including certain Toyota Dynamic Force and Honda L15B7 applications. In North American markets, these vehicles typically list ILSAC GF-6B or API SP as the applicable standard. Always verify the required certification and viscosity grade using the owner’s manual or OEM service documentation.

Is 0W-8 engine oil safe for engines?

Yes. 0W-8 engine oil is safe when used in engines specifically designed for it. These engines are built with tighter tolerances and are engineered to operate with lower viscosity oil to improve fuel efficiency without compromising durability.

Can you use 0W-16 instead of 0W-8 engine oil?

Yes, but only as a temporary substitute if 0W-8 engine oil is not available. Some manufacturers allow the use of 0W-16 in place of 0W-8 under limited conditions. However, the oil should be replaced with the specified 0W-8 grade at the next oil change. While both are ultra-low viscosity oils, they have different HTHS viscosity and fuel economy performance characteristics, and long-term use of a higher viscosity oil may not meet the intended efficiency targets.

Where to Buy

For vehicles specifying 0W-8 with JASO GLV-1 certification, AMSOIL 100% Synthetic Hybrid Motor Oil (0W-8) meets the standard. It is purpose-formulated for hybrid drive cycles — addressing the condensation, fuel dilution, and start/stop wear patterns common to HEV and PHEV applications — and carries JASO GLV-1 certification confirmed on the current product data sheet. Available through Vyscocity

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