u/ActuallyMoni

N54 no codes

N54 298k kms. 450hp upgraded twins. Oil changes every 5k. Issue occurs when hot or cold. Doesn't change with rpm, if anything it gets quieter can't hear it. Bad oil pressure? Sounds like top end passenger side. Early knock signs for rod bearings? Or is it injector, cam ledge tray, or timing? Maybe vacuum or hpfp or lifter?