Engine Oil

for 1969 Ford Mustang Boss 429 429ci V8 (Boss 429 Semi-Hemi) · RWD

Fluid Type

20W-50 conventional

Spec: API SF or SG (modern equivalents: SN, SP with ZDDP additive)

Capacity

7qt

6.62 L

Drain & Refill

6 qt

5.68 L

Change Interval

3,000 mi

4,827 km

Notes

Semi-hemi big-block with hydraulic lifters. Requires ZDDP additive with modern oils. Higher capacity due to dry sump-style pan. Capacity includes filter.

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Other fluid systems on this vehicle

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.

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