Hi guys,
Can a few of you look at this car and tell me what you think regarding price and history please?
Mercedex Benz 300E same owner last 15 years

Oil changed every 3k miles, all service done by local Mercedes dealer Wilson Motors, expect trans by a transmission shop
Owner says transmission was rebuilt at 123K miles.
Repainted at Maaco 1/13 for $1200
Evaporator, timing chain, head gasket, wiring harness never had any problems and doesn't recall having them done. Car was used for real estate business ferrying clients. It's in NW WA state.
Says it starts and runs perfect from dead cold or hot, idles fine, interior near perfect. He even replaced the windshield wiper last oil change.
Only problems he knows of are the antenna doesn't raise, says check engine light is on solid took it to Wilson they told him if it doesn't flash it's ok. Is this bs advice?
I can't recall, I owned a Euro 260E years back and a w109, loved the w124 by the way but can't recall an engine light on.
I asked how he arrived at the price, said he took book of $2700 and added the $1200 paint job, set the price there. Sounds like there's some room on price and he says I can take to any shop of choice for a PPI and all records he has and at Wilson go with the car, I've spoken to him but not yet seen/driven the car.
Anyway, posting this to see if any of you experienced guys might have an opinion to share.
(I will say there are a lot of tired w124's out there, it is time consuming looking at them all on craigslist)
Thanks, Bill