MS-12633 is a proprietary engine oil material standard issued by Chrysler — later Fiat Chrysler Automobiles (FCA), and now Stellantis — specifying performance requirements for SAE 0W-40 full-synthetic engine oil in high-output HEMI-based gasoline engines. If your vehicle is equipped with a 6.4L or 6.2L SRT HEMI and your owner’s manual calls for an oil meeting MS-12633, the specification matters in two practical ways: it defines the lubricant chemistry required to protect your engine, and it establishes what qualifies as a compliant oil for warranty purposes.
The consequences of ignoring it are not trivial. High-output HEMI engines — particularly those equipped with the Multi-Displacement System (MDS) — have a documented history of cam and lifter wear when lubrication is inadequate. An oil that meets MS-12633 is formulated to handle the thermal loads, valve-train stress, and rapid load transitions these engines produce. Using a non-compliant oil may not cause immediate problems, but it reduces your warranty protection and your margin of safety.
Let us explain what MS-12633 requires, which vehicles it applies to, which oils are certified or compliant, and how the specification relates to its successor, MS-A0921.
MS-12633 is an OEM material standard — not a universal industry classification like API SN or ACEA A3/B4, but a proprietary Chrysler specification that sits on top of those categories and adds additional performance requirements specific to the SRT engine programme.
The standard was developed in connection with the third-generation HEMI engine family, where engineers needed a lubricant specification capable of addressing the elevated thermal and mechanical demands of the 6.4L Apache and 6.2L supercharged Hellcat and Redeye units. These engines operate at significantly higher loads than the standard 5.7L HEMI and require oil with tighter performance thresholds — particularly for piston deposit control, valve-train wear protection, and oxidation stability.
The commercial context also played a role. The development of MS-12633 coincided with an OEM endorsement arrangement between Chrysler/FCA and Shell (Pennzoil), which is why Pennzoil Ultra Platinum 0W-40 became both the factory fill and the explicitly named reference product in affected owner’s manuals. The specification itself is technically neutral — any oil that passes the required testing qualifies — but the certification pathway runs through Chrysler/Stellantis, and not all lubricant manufacturers choose to pursue it.
The full text of MS-12633 is a proprietary internal document and is not publicly distributed by Chrysler or Stellantis. Based on certified manufacturers’ product data sheets and industry documentation, the specification covers the following performance areas.
MS-12633 applies exclusively to SAE 0W-40. The 0W cold-temperature rating ensures adequate low-temperature cranking and pumpability in cold climates. The 40-weight high-temperature rating maintains the film thickness required at operating temperatures and under the high shear rates produced by high-output HEMI engines. The specification does not extend to other grades.
Limits lacquer and carbon formation on piston crowns and rings under sustained high-temperature operation. Tested to ASTM D7320 / API Sequence IIIG.
Controls cam lobe and lifter wear — the most consequential failure mode in MDS-equipped HEMI engines. Tested to ASTM D6891 / API Sequence IVA.
Resists viscosity increase and acid formation across the oil change interval. Tested to ASTM D6552 / API Sequence IIIF/G.
Maximum cold-cranking viscosity at −35 °C per SAE J300 for 0W grade. Tested to ASTM D5293 (Cold Cranking Simulator).
Minimum HTHS at 150 °C consistent with SAE 40-grade requirements, typically ≥ 3.5 mPa·s. Tested to ASTM D4683 / CEC L-036.
Limits sludge formation under stop-and-go and sustained high-load duty cycles. Tested to API Sequence VH / ASTM D7320.
Controls ZDDP phosphorus volatility to protect catalytic converters. The API SN baseline sets a maximum of 0.08% phosphorus.
Meeting API SN alone does not satisfy MS-12633. The Chrysler standard adds engine-specific performance criteria — particularly around valve-train protection and piston cleanliness — and requires a formal vendor approval process that goes beyond simply passing the API test sequence.
MS-12633 is specified in owner’s manuals for Chrysler, Dodge, Jeep, and Ram vehicles equipped with high-output 6.2L and 6.4L SRT HEMI gasoline engines.
The following are the primary documented applications:
| Vehicle | Engine | Approx. Model Years |
|---|---|---|
|
Dodge Challenger
|
SRT 392 / Hellcat / Redeye / Demon6.4L Apache HEMI / 6.2L Supercharged HEMI
|
2015–2023
|
|
Dodge Charger
|
SRT 392 / Hellcat / Redeye6.4L HEMI / 6.2L Supercharged HEMI
|
2015–2023
|
|
Dodge Durango
|
SRT 392 / SRT Hellcat6.4L HEMI / 6.2L Supercharged HEMI
|
2018–2023
|
|
Jeep Grand Cherokee
|
SRT / Trackhawk6.4L HEMI / 6.2L Supercharged HEMI2014–2021Chrysler 300 SRT86.4L HEMI
|
2012–2014
|
|
Ram
|
1500 / 2500 (select variants including Power Wagon)6.4L HEMI
|
Select model years
|
Always confirm the exact specification in your owner’s manual. Earlier SRT8 applications may specify MS-10850 (SAE 5W-40) rather than MS-12633, and specifications can vary by market. Later 2021–2023 model years may reference the successor specification MS-A0921 instead.
There are two categories of oils associated with MS-12633: those that have been formally certified through Chrysler/FCA’s approval programme, and those that meet or exceed the specification requirements without pursuing formal OEM certification.
Pennzoil Ultra Platinum 0W-40 is the OEM-endorsed factory fill. It holds formal FCA certification and is named by name in owner’s manuals for affected vehicles. Pennzoil’s current product documentation now references MS-A0921 for newer applications, reflecting the specification transition.
MOPAR Engine Oil 0W-40 is the same product rebadged under the Mopar parts label. It carries the same certification.
Valvoline Advanced Synthetic / European Vehicle 0W-40 lists MS-12633 on its product data sheet as a specification met or exceeded. Formal Chrysler certification status has varied by region and formulation revision; consult current product documentation.
Schaeffer’s Supreme 9000 0W-40 has been documented in some FCA sources as an approved product. Limited retail availability makes it a less practical option for most owners.
AMSOIL Signature Series 0W-40 lists Chrysler MS-12633 and its successor MS-A0921 as stated application specifications on its official product data bulletin (G2880). Performance testing published by AMSOIL supports this claim: the product achieved 75% better cam wear protection than the industry standard in the Sequence IVA engine test (20.28 μm vs. 90 μm), maintained viscosity well under threshold at double the standard Sequence IIIH test length, and records an HTHS viscosity of 3.76 cP — above the ≥3.5 mPa·s threshold for SAE 40-grade oils. AMSOIL conducts this testing in-house rather than through Chrysler/Stellantis’s approval programme, which means the product is not formally certified but demonstrably exceeds the specification’s performance requirements. For warranty purposes, retain the product data bulletin and purchase receipts alongside your service records.
Red Line 0W-40 describes its product as a “suitable replacement” for MS-12633 applications. Formal FCA certification has not been claimed by the manufacturer, and independent performance data relative to the specification is limited.
Mobil 1 0W-40 (FS European Formula) meets ACEA A3/B4 but does not carry MS-12633 certification. Mobil’s own vehicle lookup tool confirms this. It does not claim to meet or exceed the specification.
The distinction matters, particularly for vehicles under warranty.
Formal certification means a lubricant manufacturer has submitted its formulation to Chrysler/Stellantis for testing and received an official approval. The product may carry the MS-12633 designation as a licensed mark. This process involves an approval fee and periodic reapproval when the formula changes.
Self-certification means the manufacturer has conducted the same performance tests independently — through in-house labs or third-party facilities — and declared that results meet or exceed the specification’s requirements. The oil may perform identically or better in service, but Chrysler has not independently verified the claim.
Where a manufacturer can demonstrate through published data that its product exceeds the specification requirements, that documentation becomes the foundation of any warranty protection when using a non-certified product. The strength of the data matters — broad claims without published test results carry less weight than a product bulletin that cites specific test methods and results against the specification’s criteria.
Stellantis has issued MS-A0921 as the successor to MS-12633. The updated designation aligns with the API SP service category and the ILSAC GF-6 standard introduced in 2020, which added more stringent requirements for Low-Speed Pre-Ignition (LSPI) prevention, timing chain wear protection, and piston deposit control relative to the earlier API SN baseline.
MS-A0921 is backward-compatible. An oil approved to MS-A0921 is considered suitable for any application that previously required MS-12633. Some owner’s manual revisions for 2021–2023 model-year vehicles reference MS-A0921 directly, while earlier publications continue to reference MS-12633. The two designations refer to the same engine family and the same 0W-40 grade requirement. Pennzoil’s current Canada product page for Ultra Platinum 0W-40 now lists MS-A0921 rather than MS-12633, reflecting this transition.
MS-12633 is one of several proprietary Chrysler/FCA material standards for gasoline engine oil
| Specification | SAE Grade | Primary Application | API Baseline |
|---|---|---|---|
|
MS-6395
|
5W-20, 5W-30, 10W-30
|
Standard Chrysler/Dodge/Jeep gasoline engines
|
API SN / ILSAC GF-5
|
|
MS-10725
|
5W-40
|
Selected truck and performance applications
|
API SN
|
|
MS-10850
|
5W-40
|
Earlier SRT8, SRT10, SRT6 engines
|
API SN / ACEA A3/B4
|
|
0W-40
|
6.2L and 6.4L SRT HEMI (approx. 2015–2021)
|
API SN / ACEA A3/B4
|
|
|
MS-A0921
|
0W-40
|
6.2L and 6.4L SRT HEMI (approx. 2021–present)
|
API SP / ILSAC GF-6
|
Owner’s manuals for affected vehicles call for Pennzoil Ultra Platinum 0W-40 or “equivalent MOPAR® oil meeting Chrysler Material Standard MS-12633.” This language frames the specification as a recommendation rather than an absolute warranty condition. In the United States, the Magnuson–Moss Warranty Act (15 U.S.C. § 2301 et seq.) prevents a manufacturer from voiding a warranty solely on the basis that a consumer used a non-OEM-branded product. However, the Act does not provide unconditional protection — a manufacturer can still deny a claim if it can demonstrate that the specific product used caused or contributed to the failure.
The practical implication is that product selection and documentation both matter. Using an oil with published performance data showing it meets or exceeds the specification — and keeping that data sheet alongside purchase receipts and service records — is what supports a warranty claim when using any non-factory-endorsed product. This applies equally to formally certified oils and to products such as AMSOIL Signature Series 0W-40, which exceeds the specification’s performance requirements based on published third-party test data. The stronger your documentation, the stronger your position.
Retaining receipts for every oil change is the standard professional recommendation regardless of which compliant oil is used.
MS-12633 exists because high-output HEMI engines operate at conditions that general-purpose 0W-40 oils may not address consistently — particularly around valve-train protection under MDS cycling and piston cleanliness under sustained load. The specification provides a documented performance benchmark that separates validated lubricants from those that simply meet the viscosity grade.
For owners of affected Challenger, Charger, Durango, Trackhawk, or Ram models, the practical guidance is straightforward: use an oil that explicitly states MS-12633 or MS-A0921 compliance — or publishes data demonstrating it exceeds those requirements — retain your service records and product data sheets, and confirm the requirement against your specific model year. For a convenient source of oils that meet this specification, Vyscocity stocks verified lubricants with full product data sheet documentation.
MS-12633 is a proprietary engine oil material standard issued by Chrysler (later FCA, now Stellantis) for SAE 0W-40 full-synthetic engine oil. It specifies performance requirements for high-output 6.2L and 6.4L SRT HEMI gasoline engines used in vehicles including the Dodge Challenger, Charger, Durango, Jeep Grand Cherokee Trackhawk, and select Ram models.
MS-12633 was superseded by Stellantis Material Standard MS-A0921, which aligns with the API SP and ILSAC GF-6 specifications introduced in 2020. Oils approved to MS-A0921 are backward-compatible with MS-12633 applications.
Yes. MS-12633 applies exclusively to SAE 0W-40. It does not extend to other viscosity grades. A separate Chrysler specification, MS-10850, covers SAE 5W-40 oils for earlier SRT8, SRT10, and SRT6 applications.
Pennzoil Ultra Platinum 0W-40 and its MOPAR-branded equivalent are the most widely documented products with formal FCA certification. AMSOIL Signature Series 0W-40 lists MS-12633 as a stated application specification on its official product data bulletin and publishes third-party performance data supporting that claim, but does not hold formal Chrysler/Stellantis certification. Other products including certain Valvoline formulations have listed the specification on their data sheets, though certification status can change when formulas are revised.
AMSOIL Signature Series 0W-40 lists MS-12633 as a stated application specification on its official product data bulletin and publishes performance data showing it exceeds the specification’s requirements. The Magnuson–Moss Warranty Act prevents a manufacturer from denying warranty coverage solely because a non-OEM-branded product was used, but does not provide unconditional protection if the manufacturer can show the product caused the failure. Retaining the AMSOIL product data bulletin and purchase receipts alongside your service records strengthens your position considerably.
Owner’s manuals specify MS-12633 as a recommendation rather than an absolute condition. The Magnuson–Moss Warranty Act (15 U.S.C. § 2301) prevents warranty denial based solely on brand, but a manufacturer can deny a claim if it can demonstrate the product caused the failure. Using an oil with published performance data meeting or exceeding the specification, and keeping complete documentation, is the standard professional recommendation.
An oil that genuinely passes the required performance tests will provide equivalent or better engine protection regardless of whether it holds formal OEM certification. Where a manufacturer publishes specific test data demonstrating the product meets or exceeds the specification requirements, the Magnuson–Moss Act supports warranty protection. For products that only make label claims without published supporting data, the documentation case is considerably weaker. Always check the current product data sheet rather than relying on label claims alone.
The 6.4L and 6.2L SRT HEMI engines generate elevated thermal loads and operate with the Multi-Displacement System (MDS), which cycles between 4- and 8-cylinder operation. These transitions place concentrated stress on cam lobes and lifters. A 0W-40 formulation meeting MS-12633 provides the viscosity stability and additive protection needed to manage this operating profile reliably.
Specification details are derived from publicly available product data sheets, owner’s manuals, and manufacturer documentation. The full text of MS-12633 is a proprietary Chrysler/Stellantis document and is not publicly distributed.
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