Lexus RC350 engine knocking and excessive noise issue on Lexus RC350

Some Lexus RC350 owners report experiencing engine knocking and excessive noise, which may be linked to factors such as poor fuel quality or incorrect fuel octane levels. Regular carbon cleaning or the use of fuel additives is suggested to help mitigate engine knocking. While some noise during warm-up or at idle may be deemed normal—attributed by Lexus representatives to the fuel pump—owners should be cautious of more severe noises that resemble marbles rolling inside the engine, as this could indicate serious issues like engine knocking. Additionally, some owners may encounter "rod knock," resulting from poor lubrication and wear in the connecting rod bearings, which necessitates extensive repairs. It is crucial for owners to assess these factors to determine the best approach for resolving such issues.