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I had a Ford van with the 300ci six in it years ago. When it got between 200K & 250K miles on it, it would rattle on start up. It would go away like yours in a couple of seconds. I thought it was slop in the rod bearings from wear. I solved it by going to a multi weight oil with a lower range. If I remember correctly, I used something like 20WXX and changed to 15WXX or 10WXX and the rattle went away. I figured the clearances between the bearings & the crank were getting pressured up faster with the lower weight.
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Marv Evans
'69 911E
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