How are "will-fit" GenSet replacement parts different from genuine Onan RV parts?

Onan genuine Green Label"! GenSet parts are tested and designed specifically for RV applications. Will-fit parts and gaskets can be the correct shape, but because of inadequate design, the wrong material, or poor quality, they could cause premature failure, leakage or performance problems.

Use of some non-Onan replacement engine parts may affect the unit's emissions certification, and damage caused by use of oil and air filters other than Onan/Green Label is not covered under your GenSet warranty.

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