6.9L, 7.3L IDI Service Intervals
Note - Select service intervals represent an adaptation of Ford's OEM recommendations that account for procedures not listed in the original owners manual/diesel supplement.
| Operation | Interval(s) |
| Replace engine air filter | 30,000 miles regardless of condition Check at oil change intervals, replace as necessary |
| Replace engine oil & oil filter | 5,000 miles or 6 months under normal driving conditions 2,500 miles or 3 months under severe driving conditions |
| Drain fuel water separator | 5,000 miles 6.9L IDI water separator located on driver side firewall 7.3L IDI water separator integrated into fuel filter assembly |
| Replace fuel filter | 15,000 miles under normal driving conditions 7,500 miles under severe driving conditions |
| Check & adjust drive belt tension | 15,000 miles (models with non-serpentine belt only, i.e. no belt tensioner) |
| Inspect crankcase depression regulator valve (CDR) |
30,000 miles Suggest replacing every 60,000 miles regardless of condition |
| Check coolant condition | Annually test for proper SCA/DCA level under normal conditions More frequent inspection is advised under severe driving conditions |
| Flush & replace engine coolant | 36 months regardless of mileage |
| Replace automatic transmission fluid & filter |
30,000 miles |
| Replace manual transmission fluid | 60,000 miles |
| Replace transfer case fluid | 60,000 miles (more frequent service advised if 4 wheel drive used frequently) Replace immediately anytime transfer case is submerged |
| Replace front differential fluid (4x4) | 100,000 miles under normal driving conditions 30,000 miles under severe driving conditions Replace immediately anytime differential is submerged |
| Replace rear differential fluid | 100,000 miles under normal driving conditions 30,000 miles under severe driving conditions Replace immediately anytime differential is submerged |
6.9L, 7.3L IDI Service Part Numbers
Note - All part numbers listed applicable to Ford F-Series trucks (F-250/F-350/F-Super Duty). Select part numbers may not be compatible with engines found in E-Series/Econoline vans; always verify compatibility with your parts specialist.
| Part Description | Part Number(s) | |
| Engine air filter | 6.9L, 7.3L IDI, naturally aspirated | Motorcraft FA-1057 (Ford E7TZ-9601-A) |
| 7.3L IDI, factory turbo | Motorcraft FA-1605 (Ford F3TZ-9601-Z) | |
| Engine oil filter | Motorcraft FL-784 | |
| Engine oil fill cap | Stant 11066 (Supersedes 10066) | |
| Fuel filter | 6.9L IDI | Motorcraft FD-811 Donaldson P550811 |
| 7.3L IDI | Motorcraft FD-3375 Donaldson P559852 (kit w/ bowl & drain valve) |
|
| Crankcase depression regulator (CDR) valve | Ford E3TZ-6A665-A (listed as "adapter" by Ford) | |
| CDR valve grommet/gasket | Ford E3TZ-6A892-A | |
| Fuel Lift pump (low pressure) | Carter M60278 (mechanical lift pump, engine block mounted) | |
| Glow plug | 6.9L IDI | Motorcraft ZD1A (Ford E5TZ-12A342-B) |
| 7.3L IDI | Motorcraft ZD9 (Ford F2TZ-12A342-A) | |
| Glow plug controller | 6.9L IDI | Motorcraft SW5241 |
| 7.3L IDI | Ford E7TZ-12B533-A | |
| Glow plug relay | Motorcraft DY-861 (7.3L IDI only) | |
| Thermostat | Motorcraft RT-1049 (Ford E5TZ-8575-C) | |
| Thermostat housing gasket | Motorcraft RG-531 (Ford E3TZ-8255-A) | |
| Radiator cap | Stant 10229 | |
| SCA/DCA | Motorcraft VC-8 or Fleetguard DCA4 DCA60L Use with test strips Fleetguard CC2602A to maintain SCA/DCA concentration |
|
| Engine oil cooler assembly | Ford F3TZ-6A642-C | |
| Engine oil cooler o-rings [1] | Large o-ring | Ford 1C3Z-6C610-BA |
| Small o-ring | Ford 1C3Z-6K649-BA | |
| Engine oil cooler header gaskets | Ford F7TZ-6A636-AAA (front) Ford F4TZ-6A636-A (rear) |
|
| Automatic transmission filter | C6, 3 spd | Motorcraft FT-52 (Ford D5AZ-7A098-B) |
| AOD, 4 spd | Motorcraft FT-58 (Ford E1AZ-7A098-A) | |
| 2WD E4OD, 4 spd | Motorcraft FT-113 (Ford YC3P-7G186-AB) | |
| 4WD E4OD, 4 spd | Motorcraft FT-114 (Ford YC3Z-7A098-AA) | |
[1] 1983/1984 model year 6.9L diesels may have a 6 o-ring oil cooler which requires (4) small and (2) large oil cooler o-rings. Later 6.9L diesels and all 7.3L IDI diesels require (2) small and (2) large o-rings.
6.9L, 7.3L IDI Fluid Specs & Capacities
| Component | Oil/Fluid Specification | Oil/Fluid Capacity [1] | |
| Engine oil | Ambient temp > 0° F | SAE 15W-40 Recommend Amsoil Heavy Duty 15W-40 synthetic diesel oil [2] |
10 quarts w/ filter |
| Ambient temp < 60° F | SAE 10W-30 Recommend Amsoil Heavy Duty 10W-30 synthetic diesel oil |
||
| Ambient temp > 30° F | SAE 30 | ||
| Engine coolant | 50/50 mixture of ethylene glycol engine coolant and distilled water Motorcraft green VC-5 engine coolant (concentrate) Motorcraft green VC-5DIL engine coolant (pre-mixed) Motorcraft VC-8 SCA/DCA [3] |
7.25 - 7.75 gallons | |
| Automatic transmission [4] | C6 (3 spd) | MERCON V automatic transmission fluid [5] Ford/Motorcraft XT5QMC MERCON V ATF |
12 - 13.5 quarts |
| AOD (4 spd) | 12.25 quarts | ||
| E4OD (4 spd) | 13.5 quarts | ||
| Manual transmission | T-19 (4 spd) | 50W engine oil or 80W-90 non-hypoid gear oil | 3.5 quarts |
| ZF S5-42 (5 spd) | MERCON V automatic transmission fluid [5] Ford/Motorcraft XT-5-QMC MERCON V ATF Recommend Amsoil OE synthetic ATF |
3.38 quarts | |
| Hydraulic clutch system | DOT 3 brake fluid Motorcraft PM-1-C DOT 3 |
N/A | |
| Transfer case | BorgWarner BW1345 | MERCON LV automatic transmission fluid [6] Ford/Motorcraft XT-10-QLVC MERCON LV ATF Recommend Amsoil OE fuel-efficient synthetic ATF |
3.25 quarts |
| BorgWarner BW1356 | 2 quarts | ||
| Front differential | Dana 50 TTB (IFS) | SAE 80W-90 gear oil Recommend Amsoil Severe Gear 80W-90 synthetic gear oil |
2 quarts |
| Dana 60 (solid) | 3 quarts | ||
| Rear differential [7] | Sterling 10.25 | SAE 75W-140 full synthetic Recommend Amsoil Severe Gear 75W-140 synthetic gear oil |
3.25 - 3.50 quarts |
| Dana 80 | 4.2 quarts | ||
| Dana 70 | SAE 80W-90 gear oil Recommend Amsoil Severe Gear 80W-90 synthetic gear oil |
3.25 - 3.7 quarts | |
| Dana 60 | 3 quarts | ||
[1] All oil and fluid capacities are nominal; always fill to proper dipstick, fill plug, or indicator level and verify proper oil/fluid level before operating vehicle.
[2] For high mileage engines, consider a high TBN engine formulation such as Amsoil 15W-40 Heavy Duty TBN 12 synthetic diesel oil. The higher TBN level will counteract acids produced by blowby contamination, keeping the PH level of the engine oil balanced for a longer duration. Amsoil full synthetic diesel oils are premium products that typically reduce fuel dilution and oil consumption in aging diesel engines.
[3] Supplemental coolant additive/diesel coolant additive (SCA/DCA) required to prevent cavitation. Use per instructions and periodically test and adjust SCA/DCA level to prevent cavitation in 7.3L IDI diesels.
[4] Total fluid capacity listed for all automatic transmissions; service refill capacity will be much less.
[5] MERCON V supersedes original MERCON automatic transmission fluid specification.
[6] MERCON LV supersedes original MERCON ATF and previous XL-12 transfer case fluid specification. Do NOT use MERCON V in transfer cases. Recommend Amsoil OE fuel efficient ATF, a high performance alternative that meets or exceeds Ford MERCON LV spec for transfer cases.
[7] Limited slip differentials may require Motorcraft XL-3 friction modifier to prevent differential chatter; use (1) 4 oz bottle.