I think I have a blown head gasket in my G35. The car had been putting out a little bit of white smoke out of the exhaust. However, there was never a coolant problem. Until recently. I was on the freeway the other day, getting random misfires CEL. Power seemed to be down just a little. Exhaust sounded more like a 4 cylinder. The next day I checked all the plugs. 2 of them were soaked in oil. and had some type of gritty material on them. The grit looked like metal, like it could have been bits of a piston ring broken up into tiny granules. I thought they would be metal, but the bits were brittle.
My question is, would the head gasket material look like metal but also be brittle? I'm curious as I've read the oil could come from bad valve seats, or from crank case by way of slipping past the piston rings. At any case, this block is probably shot. Hoping to have it swapped out by next weekend!