tmark

My indie Volvo mechanic tells me the copper washers are for the red block engines while the shiny washers are for the white block. I also read on one of the Volvo boards using the wrong washer on a white block could result in a leak from around the drain plug. It doesn't take as much force to compress the shiny washer (and seal the area around the drain plug) as it would to compress a harder metal like the copper one.