Engine Oil

for 1955 Plymouth Plaza 230ci I6 · RWD

Fluid Type

SAE 30 or 10W-30 non-detergent or detergent

Spec: API SA/SB (period-appropriate) or modern API SN for detergent oil

Capacity

5qt

4.73 L

Drain & Refill

5 qt

4.73 L

Change Interval

1,000 mi

1,609 km

Notes

Flathead 230 cubic inch inline-6. Original spec called for non-detergent oil; modern detergent oils are acceptable. Includes filter if equipped (many were not from factory)

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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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