Getting ready to do the head gasket on 350sdl w/ 245k on the clock. I have read so much on this forum about this vehicle, so thanks for all before me. I hope to get some pictures and share with others this journey. Great ride that was well taken care of before I purchased. I heard that Mercedes diesels go forever, so I was unaware of the problems the 350 carried. Other than oil in the coolant the vehicle shows no signs of terminal problems yet. After the head is off, I should know for sure the fate of the vehicle. Productive suggestions are welcome.