Delivers 100% synthetic engine protection for advanced automotive technology, including turbos and direct injection. Specifically formulated for the longer drain intervals recommended by original equipment (OE) manufacturers.
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Product data sheets
View, download, or save a copy of the Product Data Sheet or Safety Data Sheet for AMSOIL OE 0W-40 100% Synthetic Motor Oil.
AMSOIL OE 0W-40 100% Synthetic Motor Oil is a fully synthetic gasoline engine oil engineered for high-output engines that specify an SAE 0W-40 grade and follow the manufacturer-recommended drain interval. The formulation meets API SP, API SN Plus, and API SM service categories, and it is built to deliver wear, deposit, and turbocharger protection for advanced automotive technology that includes turbochargers and gasoline direct injection. OE 0W-40 is a strong fit for owners who want a 100 percent synthetic at a value tier and who plan to keep the factory drain schedule along with the original new-vehicle warranty intact.
Advanced wear protection for high-output engines
Camshaft and piston wear can shift valve timing and reduce engine efficiency, especially in smaller-displacement, higher-output engines that often run a thinner oil film. OE Synthetic Motor Oil controls metal-to-metal contact in pistons, cams, and valvetrain components with a robust anti-wear additive package. The OE family delivered 47 percent more wear protection than required by the GM dexos1 Gen 2 specification, based on independent testing of OE 0W-20 in the Peugeot TU3M Wear Test (CEC L-38-A-94), the 100-hour four-cylinder protocol used to qualify a motor oil for that GM specification.
LSPI defense for turbocharged direct-injection engines
Low-speed pre-ignition (LSPI) is the spontaneous ignition of the fuel and air mixture before the spark fires, and the event is most damaging in turbocharged gasoline direct-injection engines common to late-model Ford EcoBoost, FCA HEMI, and many European-influenced powertrains. OE Synthetic Motor Oil features a unique chemistry designed to defend against LSPI, which can destroy pistons and connecting rods. The formulation delivered 100 percent protection against LSPI, with zero LSPI events recorded in five consecutive runs, based on independent testing of OE 5W-30 in the LSPI engine test required by the GM dexos1 Gen 2 specification.
Engine cleanliness and deposit control
OE 0W-40 has a 100 percent synthetic, pure chemical structure that resists oxidation and thermal breakdown to slow varnish and sludge formation across an OEM-length drain interval. The detergent and dispersant additive system suspends soot and contaminants so oil passages stay open and flow stays uniform. Catalytic converter protection is preserved through the API license, supporting low exhaust emissions over the service life of the oil.
Thermal stability across a wide temperature window
Synthetic base oils and an advanced additive package make OE 0W-40 well suited to today's hotter-running engines. The oil fights heat to control deposits, prevent thickening, and limit oil consumption during sustained towing pulls or long highway service. The same uniform synthetic structure stays fluid in low temperatures for easier cold starts and rapid lubrication of bearings, lifters, and chain tensioners, which reduces start-up wear in northern climates.
Specifications and licensed service categories
OE 0W-40 is licensed by the American Petroleum Institute and meets the requirements commonly listed in owner manuals that call for an SAE 0W-40 viscosity. The 0W-40 grade meets API SP, API SN Plus, and API SM. The 0W-40 grade is the only OE viscosity that does not carry the API "Resource Conserving" mark, because the higher operating viscosity is matched to high-output and severe-service applications rather than to fuel-economy targets. The other OE viscosities, including 0W-20, 5W-20, 5W-30, and 10W-30, do earn the Resource Conserving designation.
Recommended applications and service intervals
OE 0W-40 is built for engines that require any of the following specifications: API SP, API SN Plus, or API SM. Typical applications include high-output naturally aspirated and turbocharged gasoline engines, light-duty trucks running heavier loads, and performance vehicles that specify a 0W-40 grade in the owner manual. Confirm the right viscosity for the engine with the AMSOIL Vehicle Lookup Guide before ordering.
Service interval: change at the interval stated by the vehicle manufacturer or indicated by the oil life monitoring system, whichever comes first.
Filter service: change the oil filter at every oil change.
Modified engines, racing vehicles, and engines running alternative fuels such as E85, CNG, or propane fall outside the OE drain-interval guidance.
Outside the United States and Canada, follow the vehicle manufacturer's recommended drain interval.
OE Synthetic Motor Oil is compatible with other synthetic and conventional motor oils, but mixing shortens oil life and reduces performance benefits, and extended drain coverage is not supported when oils have been mixed. Aftermarket oil additives are not recommended for use with OE Synthetic Motor Oil.
Typical technical properties
Property
Value
Kinematic Viscosity at 100 C, cSt (ASTM D445)
15.3
Kinematic Viscosity at 40 C, cSt (ASTM D445)
88.0
Viscosity Index (ASTM D2270)
185
CCS Viscosity, cP at -35 C (ASTM D5293)
6024
Flash Point, C (ASTM D92)
220
Fire Point, C (ASTM D92)
232
Pour Point, C (ASTM D97)
-42
NOACK Volatility, percent weight loss (ASTM D5800)
11.4
High-Temperature High-Shear Viscosity at 150 C, cP (ASTM D5481)
4.1
Total Base Number (ASTM D2896)
8
Order OE 0W-40
OE 0W-40 is available in a quart bottle (product code OEGQT-EA), a case of 12 quarts (OEGQT-CA), a gallon jug (OEG1G-EA), and a 55 gallon drum (OEG55-EA). Using AMSOIL synthetic lubricants does not void a new vehicle or equipment manufacturer warranty, and OE Synthetic Motor Oil is Warranty Secure and backed by the AMSOIL Limited Warranty. Match the right grade for the vehicle with the AMSOIL Vehicle Lookup Guide, compare AMSOIL gasoline motor oil families in the Car Oil Guide, then order AMSOIL OE 0W-40 100% Synthetic Motor Oil.
0W-40 is an SAE J300 viscosity grade. The 0W rating describes cold-start flow, while the 40 indicates a high-temperature operating viscosity that runs thicker than common 5W-30 or 0W-20 grades. The grade is typically specified for high-output gasoline engines, including certain Ford EcoBoost truck applications, some Mopar HEMI builds, and many performance and European-influenced engines. The owner manual should list a 0W-40 viscosity recommendation before the oil is used.
Is AMSOIL OE 0W-40 a true full synthetic?
Yes. OE 0W-40 is a 100 percent synthetic gasoline engine oil. The formulation pairs synthetic base oils with detergent, dispersant, and anti-wear additives that resist thermal breakdown over the manufacturer-recommended drain interval.
Which industry specifications does OE 0W-40 meet?
OE 0W-40 meets API SP, API SN Plus, and API SM. The 0W-40 viscosity does not carry the API Resource Conserving mark, while the other OE viscosities (0W-20, 5W-20, 5W-30, and 10W-30) do earn that designation.
How long can OE 0W-40 stay in service?
In gasoline-fueled vehicles, OE Synthetic Motor Oil is recommended for the drain interval stated by the vehicle manufacturer or indicated by the oil life monitoring system. The oil filter should be changed at every oil change. Modified engines, racing vehicles, and engines running E85, CNG, or propane fall outside the OE drain-interval guidance.
What is the difference between AMSOIL OE and Signature Series?
OE Synthetic Motor Oil is formulated for the longer drain intervals recommended by the original equipment manufacturer, which is the schedule listed in most owner manuals. Signature Series is built for extended drain coverage well beyond the OEM interval and carries higher levels of detergent and anti-wear additives. Drivers following the factory drain schedule who want a 100 percent synthetic with strong wear and LSPI defense are a good fit for OE. The Car Oil Guide compares both families side by side.
Will using AMSOIL OE 0W-40 void a new vehicle warranty?
No. Using AMSOIL synthetic lubricants does not void a new vehicle or equipment manufacturer warranty. OE Synthetic Motor Oil is Warranty Secure, and all AMSOIL lubricants and filters are covered by the AMSOIL Limited Warranty.
Can OE 0W-40 be mixed with conventional or other synthetic oils?
OE Synthetic Motor Oil is compatible with other synthetic and conventional motor oils. Mixing, however, shortens oil life and reduces performance benefits, and aftermarket oil additives are not recommended for use with OE Synthetic Motor Oil.
