Issue #1 )
Hello there everyone, I have a 1981 300TDT Wagon which I recently purchased. While browsing through the ORIGINAL manual I noticed a page on cold starts. In the manual it says that on cold morning to depress the gas pedal 1/2 the way down and then when you turn the key to start the motor, to hold they key down to the right until the car begins to run without knocking.

I asked a mechanic at a non factory MB shop about this and he said no, just prime the glow plugs twice.

Issue #2) I thought my car had a vacuum leak because the power locks will lock or unlock if the car was recently turned off, but if left overnight, only the driver side will unlock/lock. Car shows no other signs of a vacuum leak.

The same mechanic said that they were meant to be like this and that it does not constitute a vacuum leak.