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Originally Posted by Jake Raby
This noise is coming from looseness in the timing chains due to the hydraulic tensioners.
Clean or replace the tensioners or change oil brands. One brand of oil made the noise completely disappear in my Wife's 996 Land Speed car, when I changed brands again the noise returned.
Wear on components like variocam wear pads, timing chains, cam drives and etc will make the noise louder and occur more often. There are solutions, you don't have to live with it and it isn't good for the engine.
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Hello Jake,
I have a Cayman S with 40,000K and lately started to hear what it sounds like lifter knocking noise, the first time was after the car sat for a week and last Saturday started having an intermittent noise. I switched from Mobil 0W-40 to Castrol Syntech 5W-40 about 5-7000K ago. BTW, I live in SoCal which has heavy traffic and warm, should I go back to Mobil 0W-40..? Your comments will be greatly appreciated
Regards, Gilles