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For a 1980 Harley Ironhead, it's recommended to use a high-quality motor oil with a viscosity of 20W-50, specifically designed for air-cooled engines. Look for oils that meet the API classification of at least SF or SG. It's also advisable to consider using oils formulated for motorcycles to ensure optimal performance and protection. Always check your owner's manual for any specific recommendations.

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1w ago

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