New 380sl owner

Alright, you guys have so far been a big help.
First, I will get my profile filled out so you know more about me.
Second, I don't know if it has ever had a valve job. I have a lot of service records for the car but they all seem to be from a later owner since they start in the early 2000's. One of the receipts does say it needed valve seals and should be running 20w-50.
Third, this is going to be a weekend toy for my wife and me, not a daily driver.

I am mechanically inclined (I actually own a tool repair business and have rebuilt one other engine in the past) so I think I could handle valve seals. I know a decent machine shop in my area and I'm sure they could do guides for me. I just want to get a little advice before I spend that money.

I did add a quart of Bardahl engine oil treatment and it cut the smoking down pretty good. Any more advice would be greatly appreciated.

Took the 380 to the muffler shop to have the hacked up exhaust system repaired. Now it is much quieter. Someone before me had done a terrible job of "fixing" the exhaust.

Once I got it home I was able to get a better look at the car and check out all the little intricacies of the car. I noticed the sun visors are missing (weird), the door locks don't want to lock, and the round chrome over the trunk lock button is missing. Now I can't open the trunk! Any ideas of how get it open? The tumbler is still there but I can't get the key to go in far enough to actually turn it.

Also, in the instrument cluster there is a dial that has a 0,1,2, and 3 on it right above the oil gauge. What does this tell me?

Thanks guys! Your being very helpful and I appreciate your patience.