Not sure what head the SDL has. I saw the service records and there is no mention of head being replaced or any overheating.

The E300 has a complete service history as well, all from the same MB dealer. It had its 45,000 service just a few months ago. The original owner is selling (college professor) so I tend to believe the miles are probably legit.

The E300 is far from my house and I have not driven it. Is it a complete slow poke, or will I be able to merge onto the expressway without getting white knuckles?

Thanks for the input so far!!