Oil Recommendation
Short answer: Per the 1968 owner’s manual (non-detergent oils are specifically not recommended), the SAE viscosities are:
| Temperature | Viscosity |
|---|---|
| Above 32°F | 20W or 10W-30 |
| 32°F down to 0°F | 10W or 10W-30 |
| Below 0°F | 5W or 5W-20 |
High-output (H.O.) engines require SAE 30 in summer (above 32°F) and 5W-20 in winter (below 32°F). Also: 5W and 5W-20 aren’t recommended for sustained high-speed driving; SAE 30 and 20W-40 may be used above 90°F; 5W-30 below 32°F; 10W-40 between 0 and 90°F.
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Content last modified: June 13, 2026 at 10:06 am
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