re: Okay GM and Toyota, it's now your turn

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The cast aluminum oil pan.

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Rear main cover more often than the oil pan, followed by valve covers, oil pressure sender, and the block-off plate for the oil cooler. Had every single one of these leak on my fiancee's 2004 5.3l Silverado. Still keeping the truck though, it's dead reliable even if it marks its territory.

My 2000 F-150 5.4L doesn't leak a drop though.