If it was an '86 500SEL, it probably WAS a euro model. 560 engine only available after 1985 my.

I don't know what a leaking oil piston is either.

Cosmetically it ought to cleanup nice.

They are nice SAFE cars for the money. But the sunroof if it's jammed, it probably never got the lube jobs it needed, and so now it's a dealer fix, lots of hours and $$$. (The pop up feature was an inherently weak spot....)

Hopefully the timing chain tensioners and PLASTIC guide rails were done, if not, it's way past time, and you *must*) eat this expense.

(So, theoretically those two things could be over $1500 to get right) which is great negotiating leverage for you...)

One thing not often mentioned here as a general plus, is the overall comfort, build quality, and SAFETY. Worst come to worst, the car could save your life in the mother of all accidents. Value of that = Priceless.

Good luck

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)