This is a flollow up to a previous post about oil in the coolant on my M104 C280. I removed some coolant and have pretty much determined that it is engine oil and not trans oil. The coolant has an brown/amber hue, much like most motor oils. My question is this: Why has this occurred twice within 90K miles on a car that has been well cared for? And have there been improvements to the head gaskets to prevent this? Would an after-market gasket be better than a genuine MB part? What, if any, position has MB taken on this obvious defect in engineering? I've owned many cars, some up to 200K miles, and have only had to replace one head gasket.