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Like K9 says, it depends on updates that have been done to the engine. Mine has over 140k miles and still has not seen any engine work, but my engine has received all updates. Don't use oil additives in these engines, it'll end up doing more harm than good. Chain rattle could be worn ramps, does the engine have the updated tensioners? Check to see if it has the updates and get back to us.
Tom
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Ice Green '77 Targa 3.6 w/ Steve Wong chip
One Way To Get More Horsepower Is To Get A Bigger Horse!
"I couldn't find the sports car of my dreams, so I built it myself"
Ferdinand Porsche
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