How are "will-fit" generator replacement parts different from Onan Green Label Parts?

Onan genuine Green Label 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.

Damage caused by the use of oil and air filters other than Green Label Parts is not covered under your generator warranty. More.

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