The Kia Optima JF is a mid-size sedan and estate that competed with the Ford Mondeo and Volkswagen Passat in European markets. The saloon arrived late in 2015 and the Sportswagon estate a year later; the 2018 facelift replaced this 1.7 CRDi with a 1.6 CRDi, so the engine covered here runs to 2018. With the 1.7 CRDi diesel, a spacious cabin, and generous standard equipment, it offered strong value against more established rivals. Kia's industry-leading 7-year transferable warranty covered these cars from new, but it has now run out on every 1.7 CRDi, so what matters today is the documented service history it left behind.· more· less
7-year warranty transfers to next ownerSpacious cabin, generous equipment
DCT judder risk on automaticsDPF demands regular motorway driving
Buy if: You want a well-equipped mid-size car with a complete service record and primarily drive longer or mixed journeys.
Avoid if: You mostly drive short urban trips or need a DCT automatic for heavy stop-start commuting.
Price & maintenance
Used price
€12,300
median asking price, typically 140,000 km
Typical range€10,000 – €14,400
Maintenance cost
€700 – €1,300/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€450 – €700 /yr
Risk bufferunplanned repairs€250 – €600 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Used price
€12,300
Typically €10,000 – €14,400, at around 140,000 km.
Diesel particulate filter clogs rapidly if the car is not driven on longer journeys regularly · more· less
The D4FD 1.7 CRDi triggers a DPF regeneration cycle roughly every 450-500 km, and the process needs around 20-25 km of continuous motorway-speed driving to complete. If the car is used primarily for short urban trips, the regeneration cycle is interrupted repeatedly, causing soot to accumulate until the DPF becomes blocked. Symptoms include reduced power, engine warning light, and a strong sulphur smell. DPF cleaning by a specialist costs around €250-500 and can resolve the issue temporarily. A full DPF replacement, including the catalytic converter integrated into the assembly, runs €800-1,400 depending on whether OEM or aftermarket parts are used. Using the correct low-ash oil (ACEA C2/C3) is essential to prevent premature DPF loading. Many owners report DPF problems appearing after as little as 40,000 km of predominantly urban driving.
EGR valve carbon buildup
€300 - 8002 of 7
Exhaust gas recirculation valve clogs with carbon deposits, typically between 80,000 and 130,000 km · more· less
The EGR valve on the D4FD engine accumulates carbon deposits over time, particularly on cars driven in stop-start conditions. Symptoms include rough idle, hesitation under acceleration, increased emissions, and eventually the engine management light. The EGR assembly is integrated with the exhaust gas cooler and located at the rear of the engine, requiring removal of the battery, air intake, and intercooler pipework for access. Labor time is typically 4-5 hours. Cleaning the EGR valve costs around €200-350 and can buy several years of trouble-free operation. Full replacement of the EGR assembly including labor runs €500-800. Regular motorway driving and quality diesel fuel help delay the buildup.
7-speed DCT clutch judder (if equipped)
€1,200 - 2,5003 of 7
Dry-clutch dual-clutch transmission judders when accelerating from standstill in stop-start traffic · more· less
The 7-speed DCT (dual-clutch transmission) offered with the 1.7 CRDi uses a dry clutch design without a torque converter. In heavy stop-start traffic, the clutch friction surfaces overheat and glaze, causing a noticeable judder or vibration when pulling away from rest. The remedy is replacement of the dual clutch assembly, usually with a transmission control unit software update. The repair requires removing the entire transmission, with total cost including parts and labour running €1,200-2,500 depending on whether the work is done at a Kia dealer or a specialist. Some owners report the judder returning after replacement. Cars used mainly for motorway driving are far less affected, and DCT-equipped Optimas pass 150,000 km without it, so it is not inevitable. Test this specifically on a cold car in traffic.
Dual mass flywheel and clutch wear (manual)
€800 - 1,5004 of 7
Manual transmission variants can experience premature clutch and flywheel failure from 50,000 km onward · more· less
Some owners of manual-gearbox Optimas report premature clutch and dual mass flywheel failure, with isolated cases appearing as early as 50,000-80,000 km. Symptoms include a rattling noise at idle, vibration through the clutch pedal, and difficulty engaging gears smoothly. The dual mass flywheel absorbs torsional vibrations from the diesel engine, and heavy urban driving with frequent clutch engagement accelerates wear. Replacement of the clutch kit including dual mass flywheel, pressure plate, clutch disc, and release bearing runs €800-1,500 at an independent garage. Kia dealers typically quote higher. The DMF and clutch are considered wear items and are generally not covered under the standard warranty.
Turbocharger oil seal failure
€800 - 1,5005 of 7
Turbo oil seals degrade over time, causing blue or grey exhaust smoke and oil consumption · more· less
The variable geometry turbocharger on the D4FD engine is generally durable, but oil seal failure is a documented weak point on higher-mileage examples. When the seals fail, oil enters the exhaust system and burns off as blue or grey smoke, particularly noticeable under acceleration. The expected turbo lifespan is around 100,000-120,000 km, though many last considerably longer with proper oil maintenance. A remanufactured turbo installed at a specialist costs around €800-1,000, while a new OEM turbo with dealer fitting runs €1,200-1,500. Maintaining correct oil change intervals and avoiding immediate shutdown after sustained high-load driving (allowing the turbo to cool) helps extend turbo life.
Cold start and glow plug failure
€150 - 3506 of 7
Starting problems below 5°C, often caused by glow plug degradation after 60,000-80,000 km · more· less
The 1.7 CRDi engine is known to develop cold starting problems, particularly in temperatures below 5°C. The most common cause is degraded glow plugs, which fail to preheat the combustion chambers adequately. Symptoms include extended cranking, rough idle for the first 30 seconds, and white exhaust smoke on cold starts. Glow plugs on the D4FD engine typically begin to fail between 60,000 and 80,000 km. A full set of four glow plugs including labor costs €150-350. Less commonly, the issue can be traced to the common rail fuel system or a clogged fuel filter, which increases the repair cost.
Timing chain tensioner wear
€600 - 1,8007 of 7
Chain tensioner loses pressure over time, causing rattle on cold start and risk of chain skip at very high mileage · more· less
The D4FD engine uses a timing chain rather than a belt, which normally lasts the life of the engine. However, the chain tensioner can lose hydraulic pressure over time, allowing the chain to develop slight slack. This manifests as a brief rattle on cold start lasting a few seconds. The issue is more commonly reported on the Hyundai i40 with the same engine but has also been observed on high-mileage Optimas. If the tensioner is replaced early, the cost is around €600-900. If the chain has stretched and guides are worn, a full timing chain kit replacement runs €1,200-1,800. This is primarily a concern for cars approaching or exceeding 200,000 km.
Reliable diesel with standard diesel maintenance demands
The D4FD 1.7 CRDi engine is fundamentally robust and can reach 200,000+ km with proper maintenance. The main concerns are the typical diesel wear items: DPF clogging on short-trip cars, EGR buildup, and eventual turbo wear. DCT-equipped models add transmission judder risk in stop-start driving. Manual gearbox versions are generally more reliable long-term. Kia's 7-year warranty has expired on every car in this report, so a complete service record is the only protection a buyer has left.
Service history
A complete, documented service record is essential. Kia dealer stamps and independent-garage invoices both count, provided the schedule was followed and the work is documented.
Tires
Check tread depth, age (date codes), and uneven wear patterns. Standard size is 215/55 R17.
Cold start
Must start the engine completely cold. Listen for extended cranking, rough idle, or white smoke in the first 30 seconds.
Test drive
Minimum 20 minutes including varied speeds. Pay attention to transmission behavior at low speeds.
Specific for this vehicle
Check exhaust for blue or grey smoke under acceleration
Blue or grey smoke with a burning oil smell indicates turbocharger oil seal failure. Rev the engine firmly and check the exhaust.
DPF status via diagnostics
Ask for a diagnostic scan showing DPF soot loading percentage and regeneration history. High soot levels or frequent failed regenerations indicate a car used mostly for short trips.
DCT operation from standstill (if automatic)
Drive the car in stop-start conditions for at least 15 minutes. Feel for judder, vibration, or hesitation when pulling away from rest. Check for any stored transmission fault codes.
+ 3 more checksShow less
Clutch bite point and DMF rattle (if manual)
With the engine idling in neutral, listen for a rattling noise from the flywheel area. Check clutch engagement for slipping or judder during hill starts.
Check service history instead of warranty
Ask for the complete service book. The 7-year factory warranty has expired on every 1.7 CRDi, so the documented history is now the only proof of how the car was maintained.
EGR valve operation
During the test drive, check for hesitation or rough idle at low speeds. A diagnostic scan can reveal EGR-related fault codes before symptoms become obvious.
Recalls and Technical Service Bulletins
Brake vacuum pump non-return valve failure, campaign 191112 (24 July - 14 December 2015 production)Verify completed
Contact Kia with the VIN to verify all recalls have been completed. The brake vacuum pump campaign covers a narrow production window between July and December 2015. Engine-related campaigns on other Optima models were for the 2.0 and 2.4 petrol engines, but a VIN check is still the only reliable way to confirm nothing is outstanding on a specific car.
Warranty Status
Factory warranty (7 years / 150,000 km)Expired on every 1.7 CRDi, the last of which were built in 2018
Warranty transferTransfers automatically to subsequent owners, no registration required
Powertrain coverageEngine, turbo, and gearbox were covered while the warranty ran, subject to a complete service history
ExclusionsClutch, DMF, brake pads, filters, and other wear items not covered
Kia's 7-year / 150,000 km warranty was the longest standard warranty in the European market and transferred to subsequent owners automatically, but it has now expired on every 1.7 CRDi Optima. While it ran, servicing at an independent garage did not invalidate it provided the schedule was followed, suitable parts were used, and the work was documented. What matters now is that the documentation exists, because it is the only proof of how the car was maintained.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
