Two offers can both say “X-Trail T31 oil cooler” and describe substantially different assemblies. The selected 2.5L QR25DE petrol cooler is a compact stacked-plate unit with two hose connections and a cast mounting arm. The selected 2.0L M9R diesel replacement includes a larger filter-housing assembly and black cap. Neither the T31 badge nor the words “oil cooler” settle which one the vehicle needs.
There is a second trap: the presence of a CVT gearbox does not make every cooler on the vehicle a CVT cooler. The QR25DE product discussed here is an engine-oil cooler, including in its listed CVT-equipped vehicle applications. Start by identifying the engine and the system being repaired.
QR25DE petrol and M9R diesel are separate selections
| Listed Australian application | Reference and supplied assembly | Product details |
|---|---|---|
| T31/TANT31 2.5L QR25DE petrol 4WD; 10/2007–02/2014; listed manual or CVT applications | 21300-JA06A; engine-oil cooler with gasket | QR25DE petrol engine-oil cooler |
| T31/TCNT31 2.0L M9R turbo-diesel 4WD; 07/2008–11/2013; listed 110kW automatic and 127kW manual applications | 15200-00Q0F; engine-oil cooler and filter housing, with the cap and sealing gasket shown | M9R diesel cooler-and-housing assembly |
These are the specific applications covered by the linked products. They do not establish a match for every T31 engine, a later X-Trail generation or a vehicle modified with a different engine. Confirm the VIN, build month, engine code and original reference together.
What the actual petrol cooler looks like
The arm and the two outlet directions provide more useful comparison points than the silver colour alone. Check the original from the same viewing direction, including the mounting and gasket pattern. A similar stack of plates does not establish that the ports or mountings agree.
What changes on the diesel assembly
The M9R example combines the cooler with the cast filter housing. The black filter cap, twin-port mounting face and hose connection need to match the original assembly. Do not compare only the cooler stack and overlook the rest of the housing.
The linked diesel package lists the cap and sealing gasket shown. It does not list hoses, fluids or installation hardware. Ask the installer to confirm the additional servicing items the actual repair needs, rather than treating the photographed assembly as a complete repair kit.
Engine cooler or transmission cooler?
Record which system the workshop has identified before comparing references. A vehicle can have both an engine and a transmission, but that does not make the cooling components interchangeable. “Fits an automatic X-Trail” is a vehicle-application statement; it does not identify the fluid system served by an otherwise unspecified part.
For the QR25DE example, the engine-oil cooler’s listed manual and CVT applications do not turn it into a transmission replacement. For the M9R example, the automatic and manual application entries still describe the engine-oil cooler and housing. A request for a CVT or automatic-transmission cooler requires its own reference and physical comparison.
Resolve the repair scope before ordering
These photographs help identify components; they do not diagnose an oil leak, a coolant complaint or a transmission symptom. Ask the workshop to identify the affected system and failed component. A suspected seal issue and a required complete housing replacement are different repair scopes.
Useful information for a fitment enquiry includes the VIN, build month, engine code, gearbox details, original reference and clear views of the installed assembly where safely accessible. If the engine or housing has previously been changed, mention that too. Avoid dismantling or opening a hot fluid system solely to gather a comparison photograph.
Catalogue checks used here
The genuine Nissan catalogue identifies 21300-JA06A as an oil-cooler set associated with QR25DE applications and separately identifies 15200-00Q0F for the M9R cooler application. The linked PFA pages retain the narrower Australian vehicle scopes and actual assembly photographs used in this comparison.
Use the relevant product link in the table to inspect the full specification and current availability. If the engine, reference or physical arrangement disagrees, resolve the difference before choosing a replacement.
Prepared from catalogue and actual product-photo checks. The featured workshop image is an AI-generated editorial illustration. Application information reviewed on 3 November 2026.