Try this: See if the dealership has a GX550 on the lot. If so, have them open the hood and start it up. If the engine in that GX is not making the same or similar noise yours is, then their argument that the noise in yours is normal is complete BS.Hi All, we just bought a 2025 GX 550 Overtrail a few weeks ago and have noticed a knocking sound at idle coming from the engine bay after the engine has reached normal operating temp (I.e. after 10 min of driving or so). The sound is very noticeable from the cabin, especially when stopped at a stop light. The vehicle only has 800 miles. Has anyone experienced this sound? Please listen to the attached file.