PSA and Stellantis engine oil specifications explained
Specification · Stellantis / PSA
PSA B71 and Stellantis FPW9 codes are manufacturer engine-oil performance specifications used alongside viscosity. The full code and vehicle application matter; a newer-looking Stellantis code, an ACEA sequence or the right viscosity is not an automatic replacement without official compatibility guidance.
- Specification
- PSA B71 / Stellantis FPW9 oil specifications
Manual-first check
A match needs all three
- Viscosity grade The cold-start and operating-temperature grade listed in the manual.
- Oil specification The required API, ILSAC, ACEA or manufacturer performance claim.
- Exact vehicle context Engine, model year and market, including manual footnotes and exceptions.
Check a bottle label
If your manual lists PSA B71 / Stellantis FPW9 oil specifications, use the oil spec checker to compare the manual requirement with what an oil bottle says. Verify issuer-controlled evidence with the approval and license guide. Need the source first? Start with the owner's manual finder. Viscosity and approvals are separate requirements.
The complete manufacturer code matters
PSA-era manuals commonly use specifications beginning with PSA B71, followed by a four-digit identifier. Newer Stellantis materials also use FPW9.55535-style codes. These identifiers are not generic quality rankings. Each complete code represents a defined application and performance requirement.
The manufacturer code sits beside SAE viscosity. A 0W-30 or 5W-30 bottle can have the correct viscosity but the wrong manufacturer specification. ACEA wording on the bottle is useful, but it does not automatically supply a missing PSA or Stellantis claim.
Why the specification varies
Peugeot, Citroen, DS, Opel/Vauxhall and other Stellantis applications span gasoline, diesel, turbocharged, hybrid and emissions-controlled engines. Oil requirements can reflect particulate filters, timing-belt materials, deposit control, fuel economy and service intervals. The exact engine and model year therefore matter more than the group brand alone.
Compatibility and timing-belt risk
Some engines use a timing belt that operates in engine oil. In those applications, the wrong oil specification can be more than an abstract standards mismatch because oil chemistry and maintenance history can affect belt durability. Do not generalize one wet-belt engine’s requirement to every Stellantis engine, but do treat an exact manufacturer specification as a hard requirement when the manual lists it.
How to compare old and new codes
- Copy the full PSA or Stellantis code from the exact manual.
- Record viscosity and ACEA/API fields separately.
- Check current manufacturer service information for a documented replacement.
- Verify the full claim on the bottle technical data, not just a brand selector.
- Keep market, engine and emissions equipment in the decision.
What to follow
Use the latest official manual or service requirement for the vehicle. A current Stellantis specification may supersede an older PSA code for certain engines, but that relationship must be documented. If the exact code cannot be verified, do not treat a similar number, a matching viscosity or a general ACEA sequence as enough.
The public Peugeot approved-oil guidance confirms that Stellantis uses its own FPW performance specifications and directs owners back to the maintenance handbook for the exact oil. It is not a complete technical specification table or a universal compatibility list. Use the approval verification workflow, then confirm the exact vehicle requirement in current manufacturer documentation.
Frequently asked questions
What is a PSA B71 oil specification?
It is a manufacturer requirement used for particular Peugeot, Citroen, DS and related applications. The digits after B71 identify the specific requirement.
Do Stellantis FPW9 codes replace all PSA B71 codes?
Do not assume a blanket replacement. Use the exact current specification or an officially documented supersession for the engine and market.
Is ACEA C2 or C3 enough for a PSA/Stellantis engine?
Not when the manual also names a manufacturer specification. ACEA can be part of the performance basis, but it does not prove compliance with the exact PSA or Stellantis code.