Hello All,

This is my very first post, and I need help diagnosing intermittent blue smoke coming from my newly inherited 1996 MB E300. My father has owned the car for 13 years and has taken very good care of it. A little history...He purchased it with 47K miles and it currently has 165K miles. He has always used Mobil 1 Turbo Diesel synthetic every 5K miles. The head was redone approximately 35K miles ago due to a broken glow plug, so valve job and new head gasket. Recently within the last 10K miles the cooling system was gone through due to a cracked radiator. A new radiator, water pump, thermostat, and hoses were replaced. Also, within the last 2K miles the injectors were replaced with new Bosch units, all plastic lines, and delivery seals for the injection pump too. The car was parked up for 6 months due to a diesel fuel leak. My Dad told me that I could have the car if I paid for the shut off valve which was leaking because it had a crack. So, I bought the valve and seal, and with the help of my Dad we fixed the leak and the car is up and running again.

My father referred me to this forum because he has always gotten good advice and help from the members here. So, these are my symptoms with the car. When I start it in the morning, it starts right up with not a hiccup. A little puff of blue smoke only. BTW we use Diesel Kleen or Optilube in the fuel tank at regular fill ups along with Diesel purge every 3 months. When driving on the expressway and the engine reaches 2K rpms, blue smoke starts coming from the exhaust. If I accelerate to 2.5K rpms or higher the smoke goes away? If I punch the accelerator, I get some black smoke from the exhaust. Both me and my Dad are puzzled to what could be causing this. I would appreciate any insight or suggestions from you all.

Thanks in advance,

Brandon

BTW I am a senior in high school and this is my first car.