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I've found the Mobil 1 0w-40 didn't improve the cold startup rattle on my high mileage 2000 S. I was hoping that the thinner oil would hit the chain tensioner quicker and thereby eliminate the sound. If anything the sound is a little worse. It might be stopping a little sooner than before but I'm not sure. It stops within a second of the motor starting so I'm not too worried but the 0w-40 wasn't a miracle cure.
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