Rare mercedes-Benz 350SDL, DIESEL, running great, even in the subzero and snow!

1990 Mercedes-Benz 300-Series 350 SDL Description

No Reserve
Chapman alarm system working, has non-damaged keypad/fob, also.
Nice michelins all around, no cracks in sidewalls, deep tread.
New muffler (see picture).
Glow plugs operate nicely, car fires up strong in minimum time.
Power seats work. All windows work. ALL OF THEM.
Turn signals work properly.
Side mirrors work marginally, sometimes you have to help them get in a specific spot.
Blower motor is strong with no extemporaneous noises (for climate control) Air blows where it is supposed to (vent-wise).
A/C compressor belts are on and harness connected, but I have NOT checked the air. I have checked the heat and it is FINE. GREAT in this weather!!!!
Safety tinting on all windows = people can't look in easily but not so dark as to garner police attention.
I had a seasoned diesel mechanic go over the motor, and he opines that the timing chain has been changed based on evidence he found during his inspection. He says there is evidence of the head gaskets being replaced, newer water pump, and alternator, too. The battery is recent too (900 cold cranking amps) also. Its starting on the first crank (barely a bump of the key/starter, after glow plug lights go off). It tracks through the snow just fine, because of its weight/heavy rear axle/diesel torque.
This (below) was the vehicle report from last month when I first listed the car on Ebay.
Vehicle Specifics for1990 Mercedes-Benz 300-Series

Vehicle History Report Summary1990 Mercedes-Benz 300-SeriesVIN#:WDBCB35D2LA552911Report Run Date:Nov-11-2016Provided by AutoCheck, a part of Experian.Copyright Experian Information Solutions, Inc. 2010.All rights reserved.*

Highlights Title Check: OK Odometer Check: OK Accidents: None Owners: 2 See the full Vehicle History Report

AutoCheck Score 55 Below Range under25 Within Range25-45 Above range over45 Above range vs. similar1990Upscale - Luxury