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Thanks guys. The whistling noise seems to have quietened down but the ticking noise is very prominent. Is it from lifters or just the injector noise? Video link below. https://drive.google.com/file/d/1BvpEON2a22RuheflxCm7F5qxqTsCG4wV/view?usp=sharing Also, will this help if it's the lifters...

Hey everyone, need your help. I have a 2016 WN Caprice with LS3 and I just noticed a whistling noise and a ticking noise on idle. The car has 260k kms (mostly highway kms) and has been serviced at regular intervals. Any idea as to what it could be? Lifters maybe? Not sure what's causing the...