Genuine Mazda Engine Oil Cooler with Gasket – 1.8 / 2.0 • LFDJ-14-700A

Genuine Mazda Engine Oil Cooler with Gasket – 1.8 / 2.0

Replacement later-style Genuine Mazda engine oil cooler for Mazda MX-5 Mk3.5 and Mk3.75 NC models fitted with the 1.8- or 2.0-litre petrol engine.

The oil cooler is mounted within the engine oil-filter and lubrication-system assembly. Engine coolant passes through the cooler and exchanges heat with the circulating engine oil, helping the oil reach and maintain an appropriate operating temperature.

This is the revised oil-cooler design used from the Mk3.5 update onwards. It is compatible with both the 1.8-litre L8 and 2.0-litre LF engines fitted to later MX-5 NC models.

The cooler is supplied assembled with its sealing gasket. One oil cooler is fitted per engine.

• Part type: Engine oil cooler
• Common names: Oil-to-water heat exchanger / oil-filter housing cooler
• Mazda catalogue description: Cooler, Oil
• System: Engine lubrication and cooling systems
• Installation area: Engine oil-pump and filter assembly
• Function: Transfers heat between the engine oil and coolant circuits
• Design: Later-style oil cooler introduced from the Mk3.5 update
• Engine applications: 1.8-litre L8 and 2.0-litre LF petrol engines
• Quantity fitted per engine: 1
• Quantity supplied: 1 oil cooler assembly
• Sealing gasket included: Yes, assembled to the cooler
• Oil-filter housing included: No
• Oil filter included: No
• Engine oil included: No
• Engine coolant included: No
• Brand: Genuine Mazda
• Part No.: LFDJ-14-700A
• Previous Mazda reference: LFDJ-14-700
• MX-5 fitment: Mk3.5 and Mk3.75 NC, 1.8 and 2.0

Typical reasons for replacement:

• Engine oil or coolant leaking around the oil cooler
• Oil-cooler casing corroded or physically damaged
• Sealing gasket hardened, flattened or leaking
• Internal cooler failure allowing oil and coolant contamination
• Oil-filter housing or lubrication-system components being replaced
• Original cooler damaged during engine repairs
• Later-style oil-cooler conversion or engine installation being completed

Quantity advice: One oil cooler is fitted per applicable engine. This listing supplies one cooler with its sealing gasket assembled.

Fitment restriction: This is the later-style cooler used on Mk3.5 and Mk3.75 NC models from the 2009 update onwards. It is not listed here as a direct replacement for the earlier Mk3 NC1 oil-cooler arrangement.

Housing compatibility: The later cooler requires the corresponding Mazda oil-filter housing arrangement. Confirm that the correct housing and associated pipework are installed when using this cooler outside its original later-NC application.

Leak diagnosis: Oil or coolant around the cooler may originate from the cooler gasket, nearby hoses, filter housing or adjoining engine seals. Clean and inspect the assembly carefully before replacement.

Contamination advice: Evidence of engine oil in the coolant or coolant in the engine oil requires immediate investigation. A failed heat exchanger is one possible cause, but cylinder-head, gasket and other internal engine faults should also be considered.

Replacement advice: Drain the engine oil and coolant as required before removing the cooler. Prevent residual fluids and debris from entering the exposed lubrication or cooling passages.

Sealing advice: Ensure the mating surfaces are clean, flat and free from old gasket material. Confirm that the supplied gasket remains correctly located and is not pinched during installation.

Installation advice: Position the cooler squarely against the corresponding oil-filter housing and tighten the mounting hardware progressively using the applicable Mazda workshop procedure.

Cooling-system advice: Refill and bleed the cooling system thoroughly after installation. Check the engine-oil level and renew the oil and filter where contamination or major leakage has occurred.

Other items to inspect: Check the oil-filter housing, cooler mounting hardware, coolant hoses, hose clips, oil filter, engine-oil condition, expansion tank and surrounding seals while access is available.

Useful tools / consumables: Socket set, hose-clamp pliers, calibrated torque wrench, oil and coolant drain containers, suitable parts cleaner, replacement engine oil, oil filter and the specified engine coolant.

Difficulty guide: DIY Difficulty: Moderate. Replacement requires controlled draining and refilling of the lubrication and cooling systems, together with careful sealing and cooling-system bleeding.

Why Genuine Mazda? Genuine Mazda oil coolers match the original oil-filter housing, coolant passages and sealing arrangement. Correct fit is important for maintaining separation between the lubrication and cooling circuits while providing effective heat transfer.

What’s in the box: One Genuine Mazda later-style engine oil cooler with assembled sealing gasket, part number LFDJ-14-700A.

Installation notes: Allow the engine to cool fully, then drain the engine oil and coolant as required. Disconnect the relevant hoses and remove the original oil cooler according to the applicable Mazda workshop procedure. Clean and inspect the housing and mating surfaces, then install the replacement cooler with its gasket correctly seated. Reconnect the cooling-system components, refill the engine oil and coolant, bleed the cooling system and inspect carefully for oil or coolant leakage.