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Yes you can. I do in my vtx 1300 retro with 11,000 miles. With the heat generated along with the higher rpms, I believe lighter oils do not provide the best protection The 1300 is designed with large moving engine internals, and looser tolerances like big American cruisers. As long as it's not 30 or 40 degrees outside it is not a problem.

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13y ago
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Q: Can you use 20w50 in a 2003 vtx?
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