I agree that you should be cautious. I was lied to when buying my daughter's car. The guy looked me straight in the eye and lied with no flinch. He was a cold blooded &((*&(()&(& liar.

When my 240D was young, up until about 250K miles, it would start on a warm day with no glow plugging. It didn't matter how long it had set there. It is possible.

Good luck,