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20w50 is recommended in temperate zones.

If you live in an area where the temperature does not dip below 75 degrees Fahrenheit, you can use regular 50.

Clarification: If you live in an area that has cold winters, use 20w50

The "w" in ALL OILS does not refer to weight. It refers to winter. The "20w" would indicate there are additives in the oil that make it behave like 20 weight oil in cold weather.

Straight weighted oils can be used if you live in a climate that stays above the oils winter rating. All of this information is listed on a chart in your Harley Davidson user manual. If you do not have one, you should pick one up!

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13y ago

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