Catalog

VAG/PORSCHE 059117021K COOLER ASSY-OIL

Product Specifications

Product quality
OEM Equivalent Grade
starstarstar
80 sold
Wholesale price USD $10.41
Wholesale price CNY ¥72
bolt MOQ (Minimal order)
20 pcs
local_shipping Production time
43 days
package_2 Shipping Weight: 0.7 kg
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VAG/PORSCHE 059117021K
Overview & Operating Principle
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The COOLER ASSY-OIL is a heat exchanger that transfers thermal energy from hot engine oil or automatic transmission fluid into a cooler medium — either the ambient airstream passing through a dedicated external core mounted in the front bumper airstream, or the engine coolant circuit in an oil-to-water design integrated with or adjacent to the oil filter housing — to maintain oil temperature within the range required for correct viscosity, lubrication film integrity, and oxidation resistance. Engine oil coolers on performance, turbocharged, and heavy-duty engines use an air-to-oil design with an aluminium tube-and-fin or stacked-plate core mounted in front of the main radiator, routing pressurised oil from the main gallery through the core and returning cooled oil to the engine. Oil-to-water coolers — the most common type on modern passenger car engines — use a compact stacked-plate aluminium core bolted to the oil filter housing that routes oil through alternating passages separated by coolant-carrying plates; in cold start conditions the cooler acts as an oil warmer, using hot coolant to accelerate oil temperature rise and reduce cold-start wear; at sustained high load the same unit acts as a cooler, capping oil temperature by rejecting heat to the coolant circuit. Transmission oil coolers on automatic gearbox vehicles are typically integrated into the radiator end tank or mounted as a separate cooler in the front bumper airstream.

This unit — VAG/PORSCHE 059117021K — is manufactured to OEM-equivalent specifications: core dimensions and plate count, oil inlet and outlet port thread sizes and positions, coolant port geometry on oil-to-water designs, mounting bolt pattern for filter housing attachment, maximum operating pressure rating, and overall assembly dimensions for bumper or filter housing fitment are matched to the original part. Supplied as a direct replacement for standard fitment. Available wholesale from 10.41 USD, MOQ 20 pcs, production lead time 43 days.

Oil coolers fail through internal plate delamination or seal failure that allows oil and coolant to mix in the oil-to-water type — producing the characteristic milky oil or oil-contaminated coolant that indicates cross-contamination — through external corrosion of the aluminium core from road salt, and through blockage of the oil galleries with sludge from extended oil change intervals that restricts oil flow through the cooler and causes oil temperatures to rise unchecked. A failed oil-to-water cooler that has allowed coolant into the engine oil requires a complete oil system flush in addition to cooler replacement, as coolant contamination destroys the oil's lubrication properties and causes bearing damage within a short period of continued operation.

Symptoms & Diagnostics
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Milky or creamy emulsion visible on the oil filler cap, dipstick, or in the oil when drained — coolant has entered the engine oil through a failed oil-to-water cooler internal seal or plate delamination; stop the engine immediately and do not restart — oil contaminated with coolant loses its lubrication properties within minutes of operation and causes bearing failure; confirm by checking the coolant expansion tank for an oily film or the oil for a sweet smell indicating glycol contamination.
Oil film or brown emulsion visible in the coolant expansion tank — engine oil has entered the coolant circuit through the same failed cooler seal; the coolant's corrosion inhibitor is compromised by oil contamination and the coolant must be completely replaced after the cooler is renewed; check all coolant hoses and the heater matrix for oil fouling that may require flushing.
Engine oil temperature running abnormally high under sustained load — indicated by the oil temperature gauge or scan tool live data — the oil cooler core is partially blocked with sludge or the external air-to-oil core has accumulated fin debris reducing airflow; oil overtemperature accelerates oil oxidation, viscosity breakdown, and varnish deposit formation throughout the engine.
Oil pressure warning light on startup that clears within seconds on a cold engine — a partially blocked oil cooler is restricting oil flow to the extent that pressure builds slowly on cold starts when oil viscosity is high; the restriction clears as oil thins at operating temperature; confirm with a pressure gauge — lower than specified pressure during the first 30 seconds of cold running confirms a flow restriction in the cooler circuit.
External oil or coolant leak at the oil cooler mounting face or cooler body — the mounting gasket or O-ring seals have failed at the cooler-to-filter housing interface; the leak may appear as an oil seep at the base of the oil filter housing that is misidentified as a filter gasket leak; clean the area thoroughly and run the engine to identify the exact leak source before ordering replacement parts.
Automatic transmission that overheats or exhibits harsh shifting after sustained towing or low-speed heavy-load driving — the transmission oil cooler — whether integrated in the radiator or separate — is insufficient for the applied load, or has partially blocked fins reducing cooling capacity; monitor transmission fluid temperature on a scan tool and compare against the maximum operating specification.
Logistics & Customs
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International HS Code
8708.91
EAEU Customs Code (TN VED)
8708 91 200 0
Typical Net Weight
0.7 kg
Country of Manufacture
China
Standard MOQ
20 pcs
Production Lead Time
43 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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  1. On oil-to-water cooler failures with confirmed cross-contamination, perform a complete engine oil circuit flush before fitting the new cooler — coolant-contaminated oil leaves a glycol film on every internal surface including the crankshaft main bearings, camshaft journals, and oil pump gears; fitting a new cooler without flushing recirculates this contaminated film through the new cooler's passages, corroding the aluminium plates from the inside; drain the oil, fill with a dedicated engine flush compound, run for 10 minutes at idle, drain completely, and refill with fresh oil before starting the engine with the new cooler installed.
  2. Drain the coolant to below the cooler level before removing an oil-to-water cooler — the cooler is part of the pressurised coolant circuit; removing the cooler with the system full will spill several litres of coolant; collect drained coolant in a sealed container and inspect for oil contamination — brown or oily coolant confirms the cooler has been leaking internally and the entire coolant circuit requires flushing before refilling.
  3. Replace all O-ring seals and mounting gaskets at every cooler port connection and at the filter housing mounting face — the O-rings at oil and coolant ports are compressed single-use seals that will not reseal reliably if reused; use only the seals supplied with the replacement cooler or OEM-specification replacements; for oil-side seals use nitrile or HNBR compound; for coolant-side seals use EPDM compound — the two materials are not interchangeable.
  4. Torque all cooler mounting bolts to OEM specification in a diagonal sequence — uneven tightening distorts the cooler's mounting flange and prevents the gasket from sealing uniformly, creating leak paths under oil pressure cycling; on oil-to-water coolers bolted to the filter housing, the mounting bolt torque is typically 20–35 Nm — always verify in the engine-specific service data and use a torque wrench rather than tightening by feel.
  5. On air-to-oil coolers in the bumper airstream, straighten all bent fins before installation — use a fin comb of the correct fin pitch to straighten any fins damaged during shipping; a cooler with 15% or more of its fin area blocked by damage will provide measurably reduced cooling capacity; bent fins also create turbulence that erodes adjacent fins over time.
  6. Install the new COOLER ASSY-OIL (VAG/PORSCHE 059117021K), refill with fresh engine oil and the correct coolant specification, bleed the cooling system, start the engine and monitor oil pressure and oil temperature on scan tool live data for the first 10 minutes of operation, check all cooler connections for leaks under pressure, confirm oil and coolant remain uncontaminated after one full heat cycle, and perform an oil and filter change after 500–1,000 km if cross-contamination was confirmed to purge any residual contamination from the system.
Tools: torque wrench, engine flush compound for contamination cases, fin comb for air-to-oil cores, coolant drain container, OBD-II scanner with oil temperature live data, new O-ring and gasket set, fresh engine oil and coolant.
Frequently Asked Questions
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If the oil cooler has failed internally and mixed oil and coolant, what additional components require inspection or replacement?
An internal oil cooler failure that has mixed oil and coolant requires a systematic inspection of all components in both circuits. In the oil circuit: drain and inspect the oil for coolant contamination level, flush the oil circuit completely, replace the oil filter, and inspect the main bearings at the next service for premature wear from emulsified oil lubrication. In the coolant circuit: drain, flush, and refill with fresh coolant, inspect all coolant hoses for oil fouling that could contaminate the heater matrix, and check the expansion tank for residual oil film that indicates how long the contamination has been present. If the engine has been operated for more than a few hundred kilometres with confirmed cross-contamination, a full bearing inspection is warranted. ok.parts supplies oil coolers at wholesale MOQ from 10.41 USD per unit.
Can an oil-to-water cooler be replaced with an air-to-oil cooler to eliminate the risk of internal leakage?
Converting from an oil-to-water to an air-to-oil cooler is not recommended on vehicles designed with an integrated oil-to-water system. The oil-to-water cooler performs a dual function — warming the oil rapidly on cold starts to reduce cold-start bearing wear, and cooling it under sustained high load — that an air-to-oil cooler cannot replicate efficiently. An air-to-oil cooler provides no warming function in cold weather, significantly extending cold-start oil temperature ramp-up time and increasing cold-start wear. The correct repair for a failed oil-to-water cooler is replacement with an OEM-equivalent unit of the same type with all seals renewed.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
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PartReason for Combined Replacement
Oil Filter and Cooler Seal Kit
O-rings and gaskets, application-specific		Every O-ring and gasket at the cooler oil and coolant ports must be replaced with the cooler — reusing compressed seals on a newly installed cooler under oil pressure cycling produces an immediate or early leak. Always use the seal kit supplied with the replacement cooler or OEM-specification seals of the correct material compound for each circuit; oil-side and coolant-side seals are different compounds and are not interchangeable.
Engine Oil and Oil Filter
Grade and specification per OEM requirement		Oil cooler replacement requires draining the engine oil at minimum, and on cross-contamination cases requires a full flush procedure. Refilling with fresh oil and a new filter after cooler replacement removes any residual contamination and ensures the new cooler operates in a clean oil circuit. On contamination cases, a follow-up oil and filter change after 500–1,000 km is recommended to purge any remaining traces from deep within the circuit.
Coolant (Engine Antifreeze)
OAT or HOAT per OEM specification		Oil cooler replacement requires coolant drainage and provides the correct opportunity to renew the coolant if it is overdue. On contamination cases the coolant is always fully drained and the circuit flushed — refilling with fresh coolant of the correct OEM specification restores the circuit's corrosion inhibitor protection and prevents the coolant-side passages in the new cooler from being exposed to the acids present in degraded or oil-contaminated old coolant.