1978 Ford Bronco Custom, 351 cu. in. V8, SelectShift Cruise-O-Matic automatic

Service topics

6

Factory intervals

6

Fitment-scoped

6

Exact references

1

Before orderingIdentify your engine, options and build date.Part numbers and sizes can change within one model year. Shopping links appear only for catalog-backed references; still verify the listing against your vehicle before ordering.

• 01

  Engine oil

  Exact reference available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 6,000 mi / 9,600 km / 6 months · Schedule L normal service; whichever comes first. Severe service: 3,000 miles or 3 months.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed pages 106 and 108 — Schedule L oil row and note 1; severe-service note 2 · checked 2026-08-24

  1978 cataloged Bronco engines

  K&N HP-3001

  Applies to: 1978 · 351 cu. in. V8, 400 cu. in. V8 · United States

  Source: K&N — Ford Bronco replacement oil-filter catalog · 1978 Ford Bronco engine application rows — HP-3001 · checked 2026-09-01

  Verified ordering references

  • Service replacementK&N HP-3001

    Qty. 1 · Spin-on engine oil filter · catalog-listed

    K&N's manufacturer catalog lists HP-3001 for the 1978 Bronco 351 cu. in. V8 or 400 cu. in. V8 application. Confirm the installed engine before ordering.

    Catalog: K&N — Ford Bronco replacement oil-filter catalog · 1978 Ford Bronco 351 cu. in. V8 or 400 cu. in. V8 oil-filter application — HP-3001 · checked 2026-09-01

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• 02

  Engine oil filter

  Sourced interval available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 12,000 mi / 19,200 km · Replace at the first 6,000-mile oil change, then at alternate oil changes; under severe service, replace at alternate 3,000-mile oil changes.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed pages 106 and 108 — Schedule L oil-filter row and notes 1–2 · checked 2026-08-24

• 03

  Spark plugs

  Sourced interval available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 15,000 mi / 24,000 km · Schedule L normal-service replacement; severe service calls for inspect, clean and regap every 6,000 miles.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed pages 106 and 108 — Schedule L spark-plug row and severe-service note 2 · checked 2026-08-24

• 04

  Carburetor air-cleaner element

  Sourced interval available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 30,000 mi / 48,000 km · Schedule L replacement interval; service more often in severe dust.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed pages 106 and 108 — Schedule L air-cleaner row and notes 5–6 · checked 2026-08-24

• 05

  Steering, suspension and driveline lubrication

  Sourced interval available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 6,000 mi / 9,600 km · Schedule L normal-service interval; off-highway and mud/water notes require more frequent service.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed pages 107–108 — Schedule L yoke, spindle, steering and clutch lubrication rows and notes 7–8 · checked 2026-08-24

• 06

  Brake system inspection

  Sourced interval available

  Applies to: 1978 · United States, except California · Exact Ford Schedule L for 1978 Broncos certified for leaded fuel outside California; California vehicles use the separate A/B table and are not represented by these intervals.

  Published interval: 30,000 mi / 48,000 km · Inspect disc/drum components, brake lines and hoses, and master-cylinder fluid level.

  Source: Ford — 1978 Bronco Owner's Guide (preserved factory scan) · Printed page 107 — Schedule L brake inspection rows · checked 2026-08-24