I've chased the start up clatter since I got my car a couple of years ago. Changed the 2 lower tensioners and tried all kinds of oil from 0-40 to 20-50 with no significant change. The only thing that reduced, but has not eliminated the rattle has been changing to Red Line 5-40.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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