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another good indicator is your oil filter. bits of the plastic chain tensioner ramps will show up there as small, dark brown bits of plastic. There are some good images of this on 986forum. some suggest a heavier cold weight oil (i.e., a 5wxx instead of a 0wxx) so that the ramps retain a bit of lubrication on cold start (the thicker cold weight oil doesn't all run down into the sump); LNE (makers of the billet chain tensioner) recommend 5w40, and porsche now has more 5wxx than 0wxx on their lsit of approved oils.
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