Introductory Thread: 1984 W123 300D Auto w/ rare factory extras + political history

[Screwdriva]

Hi There!

Thought I'd say hello and share a bit about my pride n joy! (Pictures coming soon)

CAR:

RHD UK Registered 1984 300D Automatic Sedan with MB Tex Tan Interior, Golden Beige Exterior, Self Leveling suspension, Electric Fan, Oil Sump guard, Sunroof and Air Conditioning. Remarkably, the car has no rust anywhere despite having spent all its life here in the UK

Since purchase, I've ordered the following OEM Genuine parts:

1) Door Scraper Seals
2) Hood Insulation
3) Sunroof Scraper Seals
4) Replacement Leather Steering Wheel (off a W126)

Other treatments include

a) Waxoyl the rust prone areas in the hopes that she will stay the way she is.
b) Auto Rx treatment mixed with the engine oil to clean the motor's internals.
c) Stanadyne diesel fuel additive to clean the fuel system.

HISTORY

When I asked the previous owner about the history of the car, I was told that it was originally special ordered in 1984 for the President of India, Mira Gandhi before she died.

I didn't understand who he was referring to as India never had a President named Mira Gandhi . . .and then it clicked. The car was ordered for the Prime Minister of India, Indira Gandhi who was assassinated in 1984, just after the car was built. The administration cancelled the order and it never left Europe for India, going instead to the 1st owner, who cared for it for next 20 years.

When you look at the date of registration and the unique factory options that would better equip the car for India, the story matches up. I even wrote a letter to the car's 2nd owner, the 1st owners mechanic, who corroborated the exact same story.

QUESTIONS

1) Outside of the usual oil/ filter change, are there any other parts I need to change on the car given its age, condition and relatively unknown service history? Any treatments recommended? Sunroof service perhaps?

2) Would Mercedes Benz be able to furnish any proof to also corroborate the car's history? e.g. a purchase order from India ?