Richard says

Car Mechanics (UK) - - Diy Servicing 2012 Bmw 120d Se - RICHARD GUNN Spe­cial Con­trib­u­tor

Al­though fit­ted with a tim­ing chain, these diesel en­gines can be prone to ex­ces­sive chain wear and pos­si­ble fail­ure. If you hear a rat­tle from the rear of the en­gine, be wary. Sort­ing out the chain won’t be cheap.

Also, chang­ing the oil at reg­u­lar in­ter­vals is a wise pre­cau­tion to pre­serve the chain and the life of the tur­bocharger.

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