Every once in a while, a drop of motor oil will get on the timing belt or serpentine belt when adding motor oil.

Is it a good idea to wipe it off right away?

If so, even after wiping it off, some motor oil residue will remain on the belt. Is this an issue?

  • Put a cloth or paper before pouring oil and avoid the problem.
    – Solar Mike
    Mar 7 '19 at 17:24

No, it is not an issue.

Serpentine belts are very tough. Motor oil will not harm any rubber in or around the engine.

Wipe it off to keep the engine bay clean.

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