Hello. I am from Portugal and I have four Mercedes: 1994 S350 turbodiesel, 2002 E270 cdi, 1998 slk 200 kompressor, 1997 E220 diesel .
The other is a 1994 S350 turbodiesel:
I have already read many of posts that talk about "rod bending".
My car has 340000 km (about 212500 miles) and it never had such problem.
I also know other cars with the same engine here in Europe with lots of miles and they are very reliable, too.
But, after reading lots of posts, I am afraid that my car will bend a rod.
Actually the oil consumption is about one quart for 3200 miles.
I bought the car when it had more or less 200000 miles and I don't know anything about the past of the car. I would like to know if there is any way to discover if the engine was changed, by the engine number.
I know the original number of the engine by the chassis number but I can't find the actual engine number. I have already searched for it but I can't find it. Could you tell me where it is located in the engine? I have already searched near the injectors but I only find the engine head number, not the engine number.
I would like to ask you another thing: Can this car run on B15 (15% Biodiesel + 85 % normal diesel)? The B15 is sold near my house, and it fulfills the en14214 certification. Is there any problem of using this fuel? I have already used it, but I'm afraid of devlopping leaks in the injection pump. And can I use this fuel in a 2002 E270 cdi (common rail), too?

Best regards (and sorry for any errors in my English)