2015 Ford Mustang Oil Change — 5.0L Coyote V8 (8 Qt, 5W-50, Oil Cooler Note)

I do the oil change on my 2015 Ford Mustang GT 5.0L myself and it's one of my favorite jobs in the garage — the Coyote engine is well-engineered, accessible, and the specs are simple. The 5.0L Coyote Gen 2 takes 8 quarts of 5W-50 full synthetic, the drain plug torques to 26 ft-lbs, and the filter is in a cartridge housing on the passenger side valley of the engine. Dealer wants $140–$180 for this service. I do it for under $70 in parts.

Why 5W-50 and Not 5W-30?

The 2015 Mustang GT 5.0L Coyote specifies 5W-50 full synthetic. This is different from most modern vehicles — the higher-viscosity 50-weight oil is specified because:

1. High-RPM operation: The Coyote is a performance engine designed to rev to 7,000+ RPM. Higher viscosity maintains adequate oil film thickness at extreme RPMs.
2. Flat-tappet and roller-follower compatibility: The Coyote uses roller finger followers, but the higher-weight oil provides margin for aggressive high-RPM operation.
3. Track use cases: Owners who occasionally track their Mustangs benefit significantly from the thicker oil under sustained high-load, high-temperature conditions.

Do not substitute 5W-30 or 5W-40 in the 2015 Coyote — Ford's engineering spec is 5W-50. The only acceptable deviation is 10W-60 in extreme high-temperature environments (desert summer track days), but 5W-50 is correct for street use year-round.

Ford-approved brands: Motorcraft Full Synthetic 5W-50 (Ford part ZC-7-QUSCC) is the OEM choice. Castrol Edge 5W-50, Mobil 1 5W-50, and Royal Purple 5W-50 are also acceptable for street use.

Oil Cooler Note

The 2015 Mustang GT (and GT350 of the same era) may optionally have an engine oil cooler — a small heat exchanger typically mounted near the oil filter. If your Mustang has the factory oil cooler:

• The oil cooler houses additional oil volume (~0.5–0.75 qt depending on configuration)
• Total capacity with cooler may reach 8.5–9 quarts — check the dipstick carefully after filling
• The oil cooler itself does not need to be serviced during a standard oil change; it drains through the main oil circuit
• After the oil change, run the engine and check for leaks around the oil cooler fittings

Most 2015 Mustang GT models without a specific performance package do not have the factory cooler — but if you have a 2015 GT500 or a track-spec car, confirm by looking for the cooler assembly near the filter housing.

Tools and Parts

• 8 quarts Motorcraft Full Synthetic 5W-50 (or Castrol Edge 5W-50, Mobil 1 5W-50)
• Oil filter: Motorcraft FL-500-S (OEM cartridge-style) — this is NOT a spin-on filter
• Oil filter housing cap wrench: 3/4" drive 32mm cap wrench (or OTC 6573)
• Drain plug socket: 8mm hex (Allen) — note: this is an 8mm hex, NOT a standard socket
• Drain pan (10-quart minimum — 8 qt oil + filter drainage)
• Torque wrench
• Jack, jack stands or ramps
• Nitrile gloves, shop rags
• New O-ring for filter housing cap: Motorcraft KY-1977-A (replace annually)

Spec Sheet

Item	Spec
Oil capacity (with filter)	8 quarts
Oil type	5W-50 full synthetic (Ford WSS-M2C937-A)
Drain plug type	8mm hex (Allen head)
Drain plug torque	26 ft-lbs (35 Nm)
Oil filter	Motorcraft FL-500-S (cartridge)
Filter housing cap torque	25 ft-lbs (34 Nm)
Service interval	7,500 miles (street) / 5,000 miles (track/severe)

Filter Housing — Important Detail

The 5.0L Coyote uses a cartridge-style oil filter in a plastic housing on top of the engine (passenger side, near the firewall). You will need a 32mm cap-type socket to open the housing. Standard oil filter wrenches will NOT work. The housing is reverse-threaded — it comes off by turning clockwise when viewed from above.

The housing cap has an O-ring that should be replaced every oil change. Motorcraft KY-1977-A is the OEM part; it's inexpensive and available at any Ford dealer or NAPA.

Step-by-Step: 2015 Mustang GT 5.0L Oil Change

Warm-Up

1. Run the engine for 3–4 minutes. Shut off and wait 5 minutes.

2. Raise the Mustang on jack stands or ramps. Front clearance is tighter than a truck — quality ramps make this job faster.

Drain

3. Locate the drain plug at the rear center of the oil pan. It has an 8mm hex (Allen head) — not a socket head. Use a 3/8" drive 8mm hex bit socket.

4. Position your drain pan. Break the plug loose, spin out by hand. Oil will be hot.

5. Let drain 5–7 minutes. The Coyote's large oil capacity means more drainage time.

Change the Oil Filter

6. From the top of the engine: Locate the filter housing on the passenger side. Insert your 32mm cap socket and turn clockwise to loosen (reverse thread). Remove the cap with the attached filter cartridge.

7. Pull the old filter cartridge off the center post — it simply slides off.

8. Remove the O-ring from the housing cap. Install the new O-ring (Motorcraft KY-1977-A) — lightly oil it with fresh oil.

9. Slide the new Motorcraft FL-500-S filter cartridge onto the center post. Ensure it seats fully.

10. Thread the housing cap back in — turn counterclockwise to tighten. Torque to 25 ft-lbs (34 Nm).

Reinstall Drain Plug and Fill

11. Install a new drain plug washer (Motorcraft HX-6 aluminum gasket) on the 8mm hex drain plug. Thread in by hand, torque to 26 ft-lbs (35 Nm).

12. Fill with 7.5 quarts of 5W-50 to start. The fill cap is on the driver's side valve cover — a twist-off cap.

13. Start the engine. Watch for the oil pressure warning light to extinguish within 5–10 seconds. Idle 45 seconds.

14. Shut off, wait 3 minutes. Dipstick check: add remaining oil in small increments. Final capacity is 8 quarts — or 8.5 qt if you have the oil cooler. Fill to MAX on the dipstick, not to an exact volume.

Reset the Oil Life Monitor

15. Turn ignition to ON (engine off). Press the OK/Select button on the steering wheel to navigate to "Oil Life" in the instrument cluster. Hold OK for 5+ seconds until it resets to 100%.

Track Use Notes

• At the track with sustained high-RPM operation, change the oil every 2 track days or 1,500–2,000 track miles regardless of the OLM reading
• Pre-heat the engine (2–3 warm-up laps) before pushing it hard — cold 5W-50 is thick, and oil pressure needs to stabilize
• After a track day, check the level — the Coyote can consume a small amount of oil under sustained high-load operation

Cost Comparison: DIY vs. Dealer

	DIY	Ford Dealer
8 qt 5W-50 synthetic	$55–$75	Included
Motorcraft FL-500-S	$10–$15	Included
O-ring	$3–$5	Included
Labor	$0	$100–$130
Total	$68–$95	$150–$220+

Savings: $100–$130 per service.

For more Ford performance car maintenance guides, the 2015 Ford Mustang coolant flush guide walks through the cooling system service on the same Coyote engine, and the 2017 Ford Fusion spark plug replacement covers the 2.5L iVCT if you've got another Ford in the household.

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