2015 Ford Flex maintenance schedule

The 2015 Flex is part of the D4 generation (2014-2019), sold as a wagon. Below: its service intervals with the source behind each one, the fluids it takes, the problems owners report for this year, and the NHTSA recalls issued for it.

Service schedule

What the 2015 Flex needs, and when

All 12 of these items come from Ford's own published schedule. Manufacturer rows link to Ford's own schedule, Independent rows to a service shop or parts retailer's published guide.

ServiceIntervalSource
Engine oil and filter

Severe duty: 5000

7,500 mi / 6 monthsManufacturer
Engine air filterInspect, replace as neededManufacturer
Cabin air filter20,000 miManufacturer
Tire rotation7,500 mi / 6 monthsManufacturer
Brake fluid3 yearsManufacturer
Engine coolant

Internal water pump watch

100,000 mi / 6 yearsManufacturer
Transmission fluid

PTU fluid 30k recommended

150,000 miManufacturer
Spark plugs

EcoBoost: 60000

100,000 miManufacturer
Serpentine beltInspect, replace as neededManufacturer
Differential and transfer case fluid (AWD)

PTU catastrophic failure risk

150,000 miManufacturer
PCV valve100,000 miManufacturer
12V batteryInspect, replace as neededManufacturer

Intervals are for normal driving; towing, short trips, extreme heat or dust shorten them. Services we could not find an interval for are left off rather than guessed.

Fluids and engines

What goes in it

Engine oil
5W-20 / 5W-30, 6 qt
Coolant
Motorcraft Orange
Transmission fluid
MERCON LV

Powertrains in this generation

  • 3.5L 6-cyl (Duratec), 287 hp, 6AT, FWD/AWD
  • 3.5L 6-cyl (EcoBoost), 365 hp, 6AT, AWD

Confirm the exact spec against the owner's manual or the label under the hood; capacities vary by engine and drivetrain.

Known problems

What 2015 Flex owners run into

Problems reported for this model year, with the mileage they tend to show up at. Buying past a window is not automatically a pass - it just needs to be priced in.

Internal water pump

high severity

80,000-120,000 mi · $1,500-$2,500 to fix

Coolant mixed in oil

Source: repairpal.com

PTU Failure

high severity

From about 60,000 mi · $1,200-$2,000 to fix

Odor / AWD failure

Source: repairpal.com

Safety recalls

4 NHTSA recalls for the 2015 Ford Flex

From NHTSA's recall database, matched by model and year. Recall repairs are free at Ford dealers, and a given car may already be fixed or fall outside a campaign, so check the VIN at nhtsa.gov/recalls before you buy.

Back over prevention

NHTSA 25V695000

October 2025

Ford Motor Company (Ford) is recalling certain 2015-2019 Flex, 2015 Explorer, Lincoln MKT, Lincoln MKZ, 2015-2016 C-Max, Escape, Taurus, 2016 Fusion, 2018-2019 Taurus, 2019 Lincoln MKT, Fiesta, and 2020 Mustang vehicles. The rearview camera may display a distorted, intermittent, or blank image when the vehicle is in reverse.

Remedy: Dealers will inspect and replace the rearview camera as necessary, free of charge. This will be a phased campaign, with the remedy becoming available in different phases based on model and model years. Interim letters notifying owners of the safety risk were mailed on October 25, 2025. Additional letters will be mailed once the final remedy is available on each phase. Mustang owner notification letters were mailed January 2, 2026. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 25SA9. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on October 14, 2025.

Suspension

NHTSA 20V072000

February 2020

Ford Motor Company (Ford) is recalling certain 2013-2018 Lincoln MKT and Ford Flex and Taurus vehicles with the Police Interceptor or SHO Performance Pack. The rear suspension toe links may fracture due to stress on the rear suspension.

Remedy: Ford will notify owners, and dealers will replace the rear suspension toe links, free of charge. Remedy parts are not currently available. Owners were notified about the recall on March 3, 2020. A second notice will be mailed when remedy parts become available, which is currently expected to be the end of September 2020. The recall began October 28, 2020. Owners may contact Ford customer service at 1-866-436-7332 or Lincoln customer service at 1-800-521-4140. Ford's number for this recall is 20S04.

Fuel system, gasoline

NHTSA 16V621000

August 2016

Ford Motor Company (Ford) is recalling certain model year 2013-2015 Ford Taurus, Ford Flex, Lincoln MKS and Lincoln MKT vehicles equipped with 3.5L GTDI Ecoboost engines and 2013-2015 Ford Taurus Police Interceptor vehicles. A component within the fuel pump electric module (PEM) may overheat causing a loss of electrical power to the fuel pump.

Remedy: Ford will notify owners, and dealers will inspect the fuel PEM part number and replace the fuel PEM, as necessary, free of charge. The recall began on December 1, 2016. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 16S31.

Parking brake

NHTSA 15V464000

July 2015

Ford Motor Company (Ford) is recalling certain model year 2015 Ford Taurus, Ford Flex, and Lincoln MKS vehicles manufactured May 4, 2015, to May 23, 2015, Lincoln MKT vehicles manufactured May 4, 2015, to May 21, 2015, and 2015-2016 Ford Explorer vehicles manufactured May 4, 2015, to May 23, 2015. The affected vehicles have a parking brake that may not fully engage when applied. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 135, "Light Vehicle Brake Systems."

Remedy: Ford will notify owners, and dealers will test the operation of the parking brake system, and if necessary, replace the parking brake control assembly, free of charge. The recall began on September 4, 2015. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 15C07.

Other Flex model years

D4 (2014-2019)

Shopping new? The Ford Flex guide covers the current model, with what it costs to keep for 1 to 15 years.

Sources

Researched 2026-09-18. Modeling, not mechanic advice - always confirm against your car's owner's manual and service records.

Running a Flex for income?

Carlyle scores the exact listing on cost per remaining mile and projected Turo income, so you know what a 2015 Flex earns before you buy it.

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